Alkaline Earth Or Magnesium Containing Patents (Class 501/135)
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Patent number: 7781358Abstract: An antiferroelectric ceramic material that can be formed into a multilayer capacitor is disclosed. The antiferroelectric ceramic material is selected from the Pb(Sn, Zr, Ti)O3 (PSnZT) composition family.Type: GrantFiled: February 15, 2008Date of Patent: August 24, 2010Assignee: TRS Technologies, Inc.Inventors: Wesley S. Hackenberger, Seongtae Kwon
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Patent number: 7781359Abstract: There is provided a high-frequency dielectric material that has a high relative permittivity, a high Q value, and a TCF property value close to zero (0) and can realize co-firing of the dielectric material with silver (Ag) and copper (Cu). The high-frequency dielectric material is characterized by comprising a composition of main constituent materials having a formulation of CaO: 1 mole, Nb2O5: (1??×?)/3 mole, ZnO: (1??)/3 mole, TiO2: ? mole, and Li2O: ?×(1??)/6 mole, wherein 0.65???0.75, 0.09???0.15, 0.066??×??0.100, and 0.15???0.35; and 1 to 5 parts by weight, based on 100 parts by weight of the composition of main constituent materials, of a sintering aid selected from the group consisting of oxides of copper (Cu), boron (B), lithium (Li), bismuth (Bi), and vanadium (V) and a mixture of two or more of the oxides.Type: GrantFiled: April 16, 2007Date of Patent: August 24, 2010Assignee: Yokowo Co., Ltd.Inventors: Takahiro Yamakawa, Shi Luo
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Publication number: 20100200816Abstract: It is an object of the present invention to provide a dielectric elastomer composition which has a sufficient dielectric property as a high-frequency electronic component material and to which an excellent flame retardance can be imparted as necessary in consideration of an influence on environment and the high-frequency electronic component material formed by molding the dielectric elastomer composition. The dielectric elastomer composition of the present invention comprises an elastomer to which (A) carbon black and (B) at least one powder selected from among magnesium hydroxide powder and dielectric ceramic powder is added. An average particle diameter of the carbon black is 50 to 200 nm, and 5 to 40 parts by weight thereof is added to 100 parts by weight of the elastomer. In the magnesium hydroxide powder, a content of ferric oxide is not more than 0.02 wt %. In at least one measuring condition selected from among a measuring condition (1) in which a frequency is 400 MHz and a temperature is 30° C.Type: ApplicationFiled: September 25, 2008Publication date: August 12, 2010Inventor: Kouya Oohira
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Publication number: 20100204033Abstract: Zirconium dioxide powder in the form of aggregated primary particles, having a BET surface area of 30 to 150 m2/g and a Berger whiteness of at least 88%. It is prepared by atomizing a solution which comprises an organic zirconium compound and mixing it with a combustion gas and air and allowing the mixture to burn in a flame into a reaction chamber surrounded by a casing, where the temperature in the reaction chamber and along the side of the wall of the casing facing the reaction chamber is at least 500° C. Dispersion comprising the zirconium dioxide powder. Use of the zirconium dioxide powder and of the dispersion for producing ceramics.Type: ApplicationFiled: October 6, 2008Publication date: August 12, 2010Applicant: EVONIK DEGUSSA GmbHInventors: Stipan Katusic, Christoph Tontrup, Martin Moerters, Witold Katerinak
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Publication number: 20100195260Abstract: A dielectric ceramic containing ABO3 in which A is Ba, possibly with at least one of Ca and Sr, and B is Ti, possibly with at least one of Zr and Hf as its main component, and Si as a accessory component. The dielectric ceramic includes main phase grains containing the ABO3 main component and secondary phase grains having a composition different from that of the main phase grains. The ratio of the Si content in the secondary phase grains to the total content of Si in the dielectric ceramic is 40% or more so that more Si is distributed in the secondary phase grains. It is preferable that the Si content in secondary phase grains be 30 mol% or more.Type: ApplicationFiled: January 21, 2010Publication date: August 5, 2010Applicant: MURATA MANUFACTURING CO., LTD.Inventor: Masayuki ISHIHARA
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Patent number: 7767608Abstract: A dielectric ceramic-forming composition capable of being sintered at a temperature lower than that in the known art and to be formed into a dielectric ceramic material having a high dielectric constant; and a dielectric ceramic material obtained from the dielectric ceramic-forming composition are provided. The dielectric ceramic-forming composition includes a perovskite (ABO3) ceramic material powder having an average particle size of 0.01 to 0.5 ?m and a glass powder having an average particle size of 0.1 to 5 ?m, wherein the content of the glass powder is 3 to 12 percent by weight. The perovskite (ABO3) ceramic material powder is preferably a perovskite (ABO3) ceramic material powder prepared by a wet reaction.Type: GrantFiled: March 20, 2006Date of Patent: August 3, 2010Assignee: Nippon Chemical Industrial Co., Ltd.Inventors: Kyouichi Nishigaki, Shinji Tanabe, Naoaki Narishige
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Patent number: 7754634Abstract: There is provided a low-loss microwave dielectric ceramic having a composition represented by xCaO.yLn2O3.zAl2O3.mTiO2 wherein Ln is Nd or Sm, 25.0 mole %?x?75.0 mole %, 10.0 mole %?y?30.0 mole %, 10.0 mole %?z?30.0 mole %, 0.8 mole %?m?20.0 mole %, x+y+z+m=100 mole %. It has a dielectric constant in the range from 18 to 25, an extremely large Qf value ranging from 80,000 to 200,000 GHz, and a temperature coefficient of resonant frequency tunable in the vicinity of 0. It can make the applications of dielectric resonators, filters, and antennas extended to higher frequency and larger power; it can also be applied to microwave capacitors, temperature-compensated capacitors, microwave substrates, et al.Type: GrantFiled: August 5, 2008Date of Patent: July 13, 2010Assignee: Zhejiang UniversityInventors: Xiangming Chen, Xiecheng Fan
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Patent number: 7742278Abstract: There is provided a dielectric ceramic composition that is a dielectric ceramic material used for a laminated ceramic capacitor; that can be co-fired with internal electrodes mainly composed of Ni at a temperature of 1300° C. or less; and that has a high dielectric constant, good temperature characteristics of capacitance in a range of ?55 to 175° C., and a high resistivity ? at 175° C. The dielectric ceramic composition includes a main component represented by a composition formula (1-a) (K1-xNax)(Sr1-y-zBayCaz)2Nb5O15-a(Ba1-bCab)TiO3 (where a, b, x, y, and z are all molar amounts and 0.3?a?0.8, 0?b?0.2, 0?x<0.2, 0.1?y?0.5, 0.1?z?0.5, and 0.2?y+z?0.7); and M, as an additional component, in an amount of 0.1 to 40 parts by mole relative to 100 parts by mole of the main component (where M is at least one element from the group of V, Mn, Cr, Fe, Co, Ni, Zn, Mg, and Si).Type: GrantFiled: December 10, 2009Date of Patent: June 22, 2010Assignee: Murata Manufacturing Co., Ltd.Inventor: Toshikazu Takeda
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Publication number: 20100152018Abstract: Hardness, ageing resistance, wetting behavior in relating to water and high thermal conductivity are known characteristics of sintered molded bodies consisting of aluminum oxide; high strength and a high resistance to cracking, i.e., damage tolerance are known characteristics of sintered molded bodies consisting of zirconium oxide. These properties are combined in a material having a large fraction of aluminum oxide, zirconium oxide and optionally strontium aluminate.Type: ApplicationFiled: April 25, 2008Publication date: June 17, 2010Inventors: Meinhard Kuntz, Ana Herrán Fuertes, Kilian Friederich, Norbert Schneider
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Publication number: 20100139957Abstract: To provide a ceramic composition not only having little compositional variation after burning, but a high flexural strength of the sintered body, and a high Q value in a microwave band, a ceramic composition used for forming a ceramic layer of a multi-layer ceramic substrate contains 47.0 to 67.0 wt. % of SiO2, 21.0 to 41.0 wt. % of BaO, and 10.0 to 18.0 wt. % of Al2O3, and contains as a first additive, 1.0 to 5.0 parts by weight of CeO2, relative to a total of 100 parts of SiO2, BaO and Al2O3, and as a second additive, 2.5 to 5.5 parts by weight of MnO, relative to a total of 100 parts by weight of SiO2, BaO, Al2O3 and CeO2, and is substantially free of Cr. As a third additive, at least one of Zr, Ti, Zn, Nb, Mg and Fe, and as a fourth additive, a Co component and/or a V component, may be contained.Type: ApplicationFiled: February 16, 2010Publication date: June 10, 2010Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Machiko MOTOYA, Tsutomu Tatekawa, Jun Urakawa, Tsuyoshi Katsube, Yoichi Moriya
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Patent number: 7732361Abstract: The invention intends to provide a dielectric porcelain composition for use in electronic devices which can be controlled in the temperature coefficient ?f in particular in a negative direction and can shorten a sintering period while maintaining a high Qf value and a high dielectric constant. According to the invention, in conventional composition having a composition formula represented by XBa(Mg1/3Ta2/3)O3—Y(BazSr1-z)(Ga1/2Ta1/2)O3, when Mg is substituted by Ni to form a specific structure, the temperature coefficient ?f can be controlled in a negative direction and the ?f can be controlled in the range of 0.80 to ?4.45 ppm/° C. while maintaining a high Qf value and a high dielectric constant, and even when a sintering period, which has been so far necessary substantially 50 hr, is reduced to 25 hr substantially one half the above, similar Qf value can be obtained.Type: GrantFiled: August 11, 2005Date of Patent: June 8, 2010Assignee: Hitachi Metals, Ltd.Inventor: Takeshi Shimada
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Publication number: 20100136712Abstract: The invention provides a Ti doped lead barium zirconate dielectric material which could be applied to high frequency devices. The material comprises a compound with the chemical formula (PbI-XBaX)(ZrI-YTiY)O3, wherein X is greater than 0.3 and smaller than 1; Y is greater than zero and smaller than 0.5. The said dielectric material is tunable. A method for producing a dielectric film comprises the following steps. Firstly, prepare a Ti doped lead barium zirconate dielectric material by a first process which is one chosen from a group consisting of a solid state process, a coprecipitation process, a sol-gel process, and a hydrothermal process. Secondly, integrate the dielectric material into a target device using a second process to form a dielectric film, wherein the second process is one chosen from a group consisting of a chemical solution deposition process, a sputtering process, a chemical vapor deposition process, and a pulse laser deposition process.Type: ApplicationFiled: December 2, 2008Publication date: June 3, 2010Inventors: HUI-YUN BOR, Chao-Nan Wei, Yuan-Pang Wu, Cuo-Yo Nieh, Jian-Hong Liao
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Patent number: 7727921Abstract: A dielectric ceramic composition that is used for a monolithic ceramic capacitor, can be cofired with internal electrodes mainly composed of Ni at a temperature of 1200° C. or less, and has a high resistivity is provided. The dielectric ceramic composition is mainly composed of a tungsten bronze type complex oxide having a composition formula of (K1-xNax)Sr2Nb5O15 (wherein 0?x<0.2) and further contains, as accessory components, 0.05 to 20 molar parts of R (wherein R is at least one selected from the group consisting of Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and 0.05 to 40 molar parts of M (wherein M is at least one selected from the group consisting of Mn, V, Li, Si, Ni, Cr, Co, Fe, Zn, Mg, and Zr) per 100 molar parts of the main component.Type: GrantFiled: August 13, 2009Date of Patent: June 1, 2010Assignee: Murata Manufacturing Co., Ltd.Inventor: Toshikazu Takeda
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Publication number: 20100120607Abstract: A glass-free microwave dielectric ceramic that can be sintered at low temperature, and a manufacturing method thereof are provided. The glass-free microwave dielectric ceramic composition includes a composition represented by a formula, M2+N4+B2O6, wherein M is one element of Ba, Ca and Sr, and N is one element of Sn, Zr and Ti. The M may be replaced by two elements of Ba, Ca and Sr different from each other, to form a composition represented by a formula, (M1-x2+Mx2+)N4+B2O6, wherein 0<x<1. The N may also be replaced by two elements of Sn, Zr and Ti different from each other, to form a composition represented by a formula, M2+(N1-y4+Ny4+)B2O6, wherein 0<y<1. Furthermore, it is also possible to replace both of the M and N to form a composition represented by a formula, (M1-x2+Mx2+)(N1-y4+Ny4+)B2O6, wherein 0<x<1 and 0<y<1.Type: ApplicationFiled: November 22, 2007Publication date: May 13, 2010Applicant: Korea Institute of Ceramic Engineering & Technolog yInventors: Hyo Tae Kim, Jong Hee Kim, Myung Hwa Nam
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Publication number: 20100120605Abstract: A material composed of a large fraction of aluminum oxide, zirconium oxide and strontium aluminate.Type: ApplicationFiled: April 25, 2008Publication date: May 13, 2010Inventors: Meinhard Kuntz, Peter Schröter, Wolfgang Jaschinski, Volker Sommer
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Publication number: 20100105538Abstract: A method for manufacturing microwave dielectric ceramics has the steps of: mixing multiple A-metal compounds and sintering multiple A-metal compounds between 1350˜1450° C. for 2˜4 hr to make a first component Ba5+y(Nb1?kMnk)4O15; mixing and sintering multiple B-metal compounds to make a second component Ba1+zNb2O6; and mixing the first component Ba5+y(Nb1?kMnk)4O15, the second component Ba1+zNb2O6 and at least one sintering aid to make a third component (1?x)Ba5+y(Nb1?kMnk)4O5-xBa1+zNb2O6; wherein x, y, z and k are molar fractions and 0?x<1, 0<y?0.3, 0?z?0.3, 0?k?0.1; and the at least one sintering aid is 0.3˜3 wt %. The microwave dielectric ceramics of (1?x)Ba5+y(Nb1?kMnk)4O15-xBa1+zNb2O6 have superior microwave properties, low sintering temperature, simple chemical composition and manufacturing requirements applicable to low temperature co-sintered ceramic systems so no re-tooling is required.Type: ApplicationFiled: October 29, 2008Publication date: April 29, 2010Applicant: WALSIN TECHNOLOGY CORPORATIONInventors: Hong Wang, Huanfu Zhou, Xi Yao, Ruey-Tzeng Chang, Huey-Ru Chen, Chung-Kai Wen
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Publication number: 20100092375Abstract: The present invention provides an amorphous fine-particle powder which enables to obtain a fine perovskite-type barium titanate powder free from residual by-products such as barium carbonate and stable in quality, and a method for producing the amorphous fine-particle powder. The amorphous fine-particle powder is a fine-particle powder including titanium, barium, lactic acid and oxalic acid, wherein: the average particle size thereof is 3 ?m or less; the BET specific surface area thereof is 6 m2/g or more; the molar ratio (Ba/Ti) of Ba atoms to Ti atoms is 0.98 to 1.02; and the amorphous fine-particle powder is noncrystalline in X-ray diffraction and has a peak of an infrared absorption spectrum in each of a region from 1120 to 1140 cm?1 and a region from 1040 to 1060 cm?1.Type: ApplicationFiled: February 19, 2008Publication date: April 15, 2010Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.Inventor: Junya Fukazawa
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Patent number: 7691286Abstract: A piezoelectric ceramic composition includes a primary component represented by the formula (1-x)(K1-a-bNaaLib)m(Nb1-c-dTacSbd)O3-xM1nM2O3, and 0.1 to 10 moles (preferably 1.5 to 10 moles) of at least one specific element selected from the group consisting of In, Sc, Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and Lu with respect to 100 moles of the primary component, wherein M1 is Ca, Sr, or Ba M2 is Ti, Zr, or Sn; and x, a, b, c, d, m, and n satisfy 0.005?x?0.1, 0?a?0.9, 0?b?0.3, 0?a+b?0.9, 0?c?0.5, 0?d?0.1, 0.9?m?1.1, and 0.9?n?1.1. Preferably, Mn, Ni, Fe, Zn, Cu, or Mg is further added. As a result, at both a very low and a high electric field, a high piezoelectric d constant can be stably obtained with a high efficiency.Type: GrantFiled: September 10, 2007Date of Patent: April 6, 2010Assignee: Murata Manufacturing Co., Ltd.Inventors: Shinichiro Kawada, Ryoko Katayama, Katsuhiro Horikawa
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Publication number: 20100081558Abstract: This invention relates to ceramic powders comprising a zirconia-based component, e.g., yttria-stabilized zirconia, and an (alumina+silica)-based component, e.g., mullite. The ceramic powders are useful for forming thermal shock resistant coatings having the same composition, through deposition by thermal spray devices. This invention also relates to thermal barrier coating systems suitable for protecting components exposed to high temperature environments, such as the thermal environment of a gas turbine engine. This invention further relates to forming free-standing solid ceramic articles.Type: ApplicationFiled: October 2, 2006Publication date: April 1, 2010Inventor: Thomas Alan Taylor
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Patent number: 7674738Abstract: A translucent ceramic contains a main component composed of a tungsten-bronze-type compound represented by a general formula {(Sr, Ba)NbvOw} (wherein v satisfies the relationship 1.8?v?2.2 and w represents a positive number for maintaining electrical neutrality), wherein some Nb atoms are replaced with atoms of at least one of Zn and Mg, and the replacement ratio is 0.004 or more in terms of the molar ratio. It is preferable that at least one of Sn and Bi is added in an amount of 0.15 parts by weight or more in terms of SnO2 and Bi2O3, respectively, to 100 parts by weight of the main component, and that the molar ratio of Ba in the (Sr, Ba) site is in the range of 0.25 to 0.50. It is also preferable that the translucent ceramic contains Na in an amount of less than 25 parts by mole relative to 100 parts by mole of the sum of Sr and Ba, or La in an amount of less than 11 moles relative to 100 parts by mole of the sum of Sr and Ba.Type: GrantFiled: November 20, 2008Date of Patent: March 9, 2010Assignee: Murata Manufacturing Co., Ltd.Inventor: Teppei Kubota
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Patent number: 7670981Abstract: A dielectric ceramic composition in a multilayer ceramic capacitor with a composition of formula: {[(CaO)t(SrO)1-t]m[(ZrO2)v(TiO2)1-v]}1-s-xAsEx wherein: A is a transition metal oxide; E is an oxide of an element selected from the group consisting of Ge, Si, Ga and combinations thereof; m is 0.98 to 1.02; t is 0.50 to 0.90; v is 0.8 to 1.0; s and x are selected from the group consisting of: a) 0?x?0.08, 0.0001?s?0.043 and x?1.86s; and b) 0?x?0.0533, 0.0001?s?0.08 and x?0.667s.Type: GrantFiled: October 24, 2008Date of Patent: March 2, 2010Assignee: Kemet Electronics CorporationInventors: Michael S. Randall, Corey Antoniades, Daniel E. Barber, Xilin Xu, James Beeson, Pascal Pinceloup, Abhijit Gurav, Thomas Poole, Azizuddin Tajuddin, Ian Burn
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Patent number: 7662250Abstract: A production method of a dielectric ceramic composition at least including a main component including a dielectric oxide having perovskite-type crystal structure expressed by a formula ABO3 (note that in the formula, “A” indicates one or more elements selected from Ba, Ca, Sr and Mg, and that “B” indicates one or more elements selected from Ti, Zr and Hf) comprises steps of preparing a main component material including said dielectric oxide expressed by ABO3; preparing a subcomponent material including a composite oxide expressed by M4R6O(SiO4)6 (note that “M” indicates at least one selected from Ca and Sr, and that “R” indicates at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu); mixing said main component material and subcomponent material to obtain a dielectric ceramic composition material; and firing said dielectric ceramic composition material.Type: GrantFiled: March 18, 2008Date of Patent: February 16, 2010Assignee: TDK CorporationInventors: Tomoaki Nonaka, Hiroshi Sasaki, Tsutomu Odashima, Tetsuo Takaishi, Takahiro Harada
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Publication number: 20090290285Abstract: A dielectric ceramic composition that is used for a monolithic ceramic capacitor, can be cofired with internal electrodes mainly composed of Ni at a temperature of 1200° C. or less, and has a high resistivity is provided. The dielectric ceramic composition is mainly composed of a tungsten bronze type complex oxide having a composition formula of (K1?xNax)Sr2Nb5O15 (wherein 0?x<0.2) and further contains, as accessory components, 0.05 to 20 molar parts of R (wherein R is at least one selected from the group consisting of Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and 0.05 to 40 molar parts of M (wherein M is at least one selected from the group consisting of Mn, V, Li, Si, Ni, Cr, Co, Fe, Zn, Mg, and Zr) per 100 molar parts of the main component.Type: ApplicationFiled: August 13, 2009Publication date: November 26, 2009Applicant: MURATA MANUFACTURING CO., LTD.Inventor: Toshikazu Takeda
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Patent number: 7622411Abstract: There is provided a novel thermal barrier coating material which does not have a problem of phase transition, whose melting point is higher than its working temperature range, whose thermal conductivity is smaller than that of zirconia, and whose thermal expansion coefficient is greater than that of zirconia. The thermal barrier coating material comprises as a main component, a composition having an orthorhombic or monoclinic structure derived from perovskite (for example, a tabular perovskite structure expressed by the composition formula A2B2O7), or a tetragonal layer structure having a c axis/a axis ratio equal to or greater than 3 (for example, a K2NiF4 structure, a Sr3Ti2O7 structure, or a Sr4Ti3O10 structure), a composition expressed by the composition formula LaTaO4, or a composition having an olivine type structure expressed by the composition formula M2SiO4 or (MM?)2SiO4 (where M, M? are divalent metal elements).Type: GrantFiled: March 24, 2004Date of Patent: November 24, 2009Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Katsunori Akiyama, Ichiro Nagano, Masato Shida, Satoshi Ota
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Publication number: 20090270244Abstract: There is provided a low-loss microwave dielectric ceramic having a composition represented by xCaO.yLn2O3.zAl2O3.mTiO2 wherein Ln is Nd or Sm, 25.0 mole %?x?75.0 mole %, 10.0 mole %?y?30.0 mole %, 10.0 mole %?z?30.0 mole %, 0.8 mole %?m?20.0 mole %, x+y+z+m=100 mole %. It has a dielectric constant in the range from 18 to 25, an extremely large Qf value ranging from 80,000 to 200,000 GHz, and a temperature coefficient of resonant frequency tunable in the vicinity of 0. It can make the applications of dielectric resonators, filters, and antennas extended to higher frequency and larger power; it can also be applied to microwave capacitors, temperature-compensated capacitors, microwave substrates, et al.Type: ApplicationFiled: August 5, 2008Publication date: October 29, 2009Applicant: ZHE JIANG UNIVERSITYInventors: Xiangming Chen, Xiecheng Fan
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Publication number: 20090264275Abstract: A method for manufacturing barium zirconate particles includes providing a mixture of materials that includes barium, zirconium and a sintering aid, wherein the sintering aid includes at least one of barium tungstate, potassium niobate, tungsten oxide, barium molybdate, molybdenum oxide, potassium tantalate, potassium oxide, sodium niobate, sodium tantalate, sodium oxide, lithium niobate, lithium tantalate, lithium oxide, copper oxide, manganese oxide, zinc oxide, calcium zirconate and strontium zirconate; and heating the mixture of materials to produce barium zirconate particles that include the sintering aid.Type: ApplicationFiled: July 2, 2009Publication date: October 22, 2009Inventors: Michael D. Hill, David Cruickshank, David Cronin, Barry Treadway
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Patent number: 7605103Abstract: A translucent ceramic containing a main component represented by Ba{MxB1yB2z}vOw (wherein B1 is a trivalent metallic element, B2 is a quintavalent metallic element, M is at least one selected from the group consisting of Ti, Sn, Zr and Hf, x+y+z=1, 0?x?0.45, 1.00?z/y?1.04, 1.00?v?1.05, and w is a positive number required to maintain electroneutrality), or Ba{Mx(B1sB31-s)yB2z}vOw (wherein B3 is a bivalent metallic element, 0?x?0.9, 1.00?z/y?2.40, 0<s<1, and B1, B2, x+y Z and w are the same as those in the other formula). The translucent ceramic has a high refractive index, a high anomalous dispersion and excellent optical properties. The translucent ceramic is useful, for instance, as a material of an objective lens in an optical pickup.Type: GrantFiled: April 30, 2007Date of Patent: October 20, 2009Assignee: Murata Manufacturing Co., Ltd.Inventor: Yuji Kintaka
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Patent number: 7597817Abstract: Novel metal oxide compositions are disclosed. These ferromagnetic or ferrimagnetic compositions have resitivities that vary between those of semiconducting and insulating materials, and they further exhibit Curie temperatures greater than room temperature (i.e., greater than 300 K). They are perovskite structures with the general chemical formulas (A1-xMx)BO3, (A1-xMx)(B?B?)O3 or A(B1-xMx)O3, where A can be a 1+, 2+ and 3+ charged ion; B can be a 5+, 4+, 3+ charged ion; B? and B? can be 2+, 3+, 4+, 5+ and 6+ charged ion. M is a magnetic ion dopant. X-ray diffraction patterns are presented for exemplary compositions.Type: GrantFiled: April 21, 2004Date of Patent: October 6, 2009Assignee: Intematix CorporationInventors: Yi-Qun Li, Ning Wang, Qizhen Xue, Shifan Cheng, Xiao-Dong Xiang
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Publication number: 20090246541Abstract: The present invention relates to a dielectric ceramic composition comprises a main component including a dielectric oxide having a composition shown by [(Ca1-xSrx)O]m[(Zr1-y-z-?TiyHf2Mn?)O2], note that, 0.991?m?1.010, 0?x?1, 0?y?0.1, 0<z?0.02, 0.002<??0.05), 0.1 to 0.5 parts by mol of Al2O3 and 0.5 to 5.0 parts by mol of SiO2 with respect to 100 parts by mol of the main component. A purpose of the present invention is to provide a dielectric ceramic composition available to prevent the occurrence of crack even when a dielectric layer is made thin, for example, 2 ?m or less, while maintaining various advantageous properties of a dielectric ceramic composition of [(CaSr)O]m[(TiZrHf)O2] type.Type: ApplicationFiled: March 20, 2009Publication date: October 1, 2009Applicant: TDK CORPORATIONInventors: Tomoaki Nonaka, Tetsuo Takaishi, Kenta Iwasawa, Hiroshi Sasaki
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Patent number: 7595975Abstract: A dielectric ceramic including a perovskite compound represented by the general formula {(Ba1-x-yCaxSny)m(Ti1-zZrz)O3} as a primary component in which the x, y, z, and m satisfy 0.02?x?0.20, 0.02?y?0.20, 0?z?0.05, and 0.99?m?1.1 and is processed by a thermal treatment at a low oxygen partial pressure of 1.0×10?10 to 1.0×10?12 MPa. Accordingly, there are provided a dielectric ceramic which can be stably used in a high-temperature atmosphere without degrading dielectric properties, properties of which can be easily adjusted, and which generates no electrode breakage even when ceramic layers and conductive films are co-fired, and a ceramic electronic element, such as a multilayer ceramic capacitor, which uses the above dielectric ceramic.Type: GrantFiled: December 22, 2008Date of Patent: September 29, 2009Assignee: Murata Manufacturing Co., Ltd.Inventors: Shoichiro Suzuki, Hideaki Niimi
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Patent number: 7595036Abstract: Novel, monodispersed, spherical ZrO2 particles in the size range of approximately 10 to approximately 600 nm exhibiting metastable tetragonal crystal structure at room temperature and novel methods of preparation. The ZrO2 particles are approximately 100% in the tetragonal phase at room temperature and can be pure and free of foreign oxides. The novel method can include mixing zirconium-alkoxide and an alcohol, forming preparation one, followed by separately dissolving completely de-ionized water and a polymeric steric stabilizer in an alcohol forming preparation two. Next the preparations can be mixed with vigorous stirring while subjecting the materials to hydrolysis and condensation reactions with very slow stirring. Next, there is waiting for the formation of a sol from the mixture, followed by drying at approximately 80 degrees C. to form resultant material followed by crushing the resultant material.Type: GrantFiled: January 15, 2009Date of Patent: September 29, 2009Assignee: University of Central Florida Research Foundation, Inc.Inventors: Sudipta Seal, Satyajit Shukla
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Patent number: 7595006Abstract: A piezoelectric ceramic composition has the composition formula (Pb(a-b)Meb){(Ni(1-c).d/3Znc.d/3Nb2/3)zTixZr(1-x-z)}O3, wherein Me represents at least one element selected from the group consisting of Ba, Sr and Ca; a, b, c, d, x and z satisfy the inequalities 0.975?a?0.998, 0?b?0.05, 1<d?1.40, and 0.39?x?0.47; and c and z are located in a region surrounded by lines connecting Point A (z=0.25, c=0.1), Point B (z=0.25, c=0.85), Point C (z=0.1, c=0.6), Point D (z=0.075, 0.5), Point E (z=0.05, c=0.2), and Point F (z=0.05, c=0.1) or located on the lines in the z-c plane. Therefore, the piezoelectric ceramic composition can be fired at a low temperature and is effective in achieving a large piezoelectric constant, a high Curie point and a small dielectric constant. A piezoelectric actuator contains the piezoelectric ceramic composition.Type: GrantFiled: June 22, 2007Date of Patent: September 29, 2009Inventors: Atsushi Yamamoto, Koji Ogiso, Koichi Hayashi
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Patent number: 7572748Abstract: A method for manufacturing barium zirconate particles includes providing a mixture of materials that includes barium, zirconium and a sintering aid, wherein the sintering aid includes at least one of barium tungstate, potassium niobate, tungsten oxide, barium molybdate, molybdenum oxide, potassium tantalate, potassium oxide, sodium niobate, sodium tantalate, sodium oxide, lithium niobate, lithium tantalate, lithium oxide, copper oxide, manganese oxide, zinc oxide, calcium zirconate and strontium zirconate; and heating the mixture of materials to produce barium zirconate particles that include the sintering aid.Type: GrantFiled: May 10, 2007Date of Patent: August 11, 2009Assignee: Skyworks Solutions, Inc.Inventors: Michael D. Hill, David Cruickshank, David Cronin, Barry Treadway
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Publication number: 20090186753Abstract: A method for manufacturing barium zirconate particles includes providing a mixture of materials that includes barium, zirconium and a sintering aid, wherein the sintering aid includes at least one of barium tungstate, potassium niobate, tungsten oxide, barium molybdate, molybdenum oxide, potassium tantalate, potassium oxide, sodium niobate, sodium tantalate, sodium oxide, lithium niobate, lithium tantalate, lithium oxide, copper oxide, manganese oxide, zinc oxide, calcium zirconate and strontium zirconate; and heating the mixture of materials to produce barium zirconate particles that include the sintering aid.Type: ApplicationFiled: May 10, 2007Publication date: July 23, 2009Inventors: Michael D. Hill, David Cruickshank, David Cronin, Barry Treadway
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Publication number: 20090181844Abstract: Conventionally, in order to improve health problems, there have been technologies using ceramic materials, which are considered to have effects of far-infrared radiation, for accessories and films etc. These accessories and films etc. have effects of improving blood circulation or metabolism by far-infrared radiation etc. However, in the conventional technologies, the far-infrared radiation is insufficient, so that health problems cannot be sufficiently improved. The present invention provides a ceramic material, containing silicon, aluminum, iron, calcium, titanium, and potassium as major constituents; and sulfur, strontium, vanadium, and yttrium as accessory constituents. In addition, the ceramic material of the present invention may be used for products such as cloth, accessories, filters for liquid, and cosmetic products.Type: ApplicationFiled: December 22, 2005Publication date: July 16, 2009Applicant: CO-EI CO., LTD.Inventor: Masakazu Hashimoto
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Patent number: 7560406Abstract: A ceramic powder composition, ceramic material, and laminated ceramic condenser comprised thereof. The composition includes ceramic powders comprising (SrxCa1?x)TiyZr1?yO3, and a sintering aid, wherein x is between 0 and 1, and y is between 0 and 0.1. The sintering aid is Ma2O, MbO, Mc2O3, MdO2, or a combination thereof. Element Ma comprises Li, Na, K, or a combination thereof. Element Mb comprises Be, Mg, Ca, Sr, Ba, or a combination thereof. Element Mc comprises B, Al, Ga, or a combination thereof. Element Md comprises Si, Ge, or a combination thereof.Type: GrantFiled: August 8, 2007Date of Patent: July 14, 2009Assignee: Darfon Electronics Corp.Inventors: Ting-An Chien, Hsiu-Hsiang Pei
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Patent number: 7557055Abstract: An embodiment of the present invention provides an electronically tunable dielectric material, comprising at least one electronically tunable dielectric phase and at least one compound of low loss complex perovskites. The at least one electronically tunable dielectric phase may be selected from the group consisting of barium strontium titanate, barium titanate, strontium titanate, barium calcium titanate, barium calcium zirconium titanate, lead titanate, lead zirconium titanate, lead lanthanum zirconium titanate, lead niobate, lead tantalate, potassium strontium niobate, sodium barium niobate/potassium phosphate, potassium niobate, lithium niobate, lithium tantalate, lanthanum tantalate, barium calcium zirconium titanate, sodium nitrate, and combinations thereof. Further, the barium strontium titanate may of the formula BaxSr1-xTiO3, where x is from about 0 to about 1, or more specifically, but not limited in this respect, may also be of the formula BaxSr1-xTiO3, where x may be from about 0.15 to about 0.Type: GrantFiled: November 18, 2004Date of Patent: July 7, 2009Assignee: Paratek Microwave, Inc.Inventors: Xubai Zhang, Louise C. Sengupta, Elijah Underhill
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Patent number: 7556792Abstract: Ba(OH)2.8H2O is fused by heating. The fused Ba(OH)2 is allowed to react with TiO2 powder having a specific surface area of 250 m2/g or more to prepare a cubic crystalline BaTiO3 having high crystallinity. The BaTiO3 is calcined to yield a fine, tetragonal crystalline BaTiO3 powder having high crystallinity. Thus, a high quality BaTiO3 having high crystallinity can be prepared at a low cost.Type: GrantFiled: December 30, 2002Date of Patent: July 7, 2009Assignee: Murata Manufacturing Co., Ltd.Inventors: Atsuhiro Torii, Shinichi Kato, Tomohisa Tonogaki, Masaru Kojima, Kenji Tanaka
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Publication number: 20090170686Abstract: A crystallographically-oriented ceramic containing Pb and in which piezoelectric/electrostrictive properties can be enhanced. Using a raw material having Pb(Zr1-xTiX)O3 as a main component, a ceramic sheet was formed with a thickness of 15 ?m or less. In this material, grains were allowed to grow into an anisotropic shape, and crystal grains with specific crystal planes being aligned were produced. A non-oriented raw material having Pb(Zr1-xTiX)O3 as a main component and the crystal grains were mixed, and shaping was performed so that crystal grains were oriented in a predetermined direction. The shaped body was fired. In the resulting ceramic, the degree of orientation was high at 50% or more. It is possible to enhance the degree of orientation using, as crystal nuclei, a ceramic sheet which can have the same composition as that of the crystallographically-oriented ceramic. Therefore, production can be performed without adding an unnecessary element, for example, for orienting crystals.Type: ApplicationFiled: December 22, 2008Publication date: July 2, 2009Applicant: NGK Insulators, Ltd.Inventors: Yukinobu YURA, Nobuyuki Kobayashi, Tsutomu Nanataki
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Publication number: 20090155624Abstract: A ceramic mixed system is proposed that includes a two-phase mixture of pure components A and B, wherein phase A is based on the cubic to tetragonal modification of Bi3NbO7 and phase B is based on a monoclinic pyrochlore modification of Bi2(Zn2/3Nb4/3)O7. The electrical properties of ceramics produced therefrom make the material suitable for components having a multilayer structure in which capacitors and inductors are integrated and which can be used in data processing or signal processing.Type: ApplicationFiled: November 21, 2008Publication date: June 18, 2009Inventors: Pavol Dudesek, Christian Hoffmann, Matjaz Valant, Danilo Suvorov
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Patent number: 7541305Abstract: A dielectric ceramic composition having a main ingredient including a dielectric oxide expressed by the formula {(Me1-xCax)O}m.(Zr1-yTiy)O2, where the symbol Me indicating the name of the element in said formula is at least one of Sr, Mg, and Ba and where the symbols m, x, and y indicating the molar ratios of the formulation in the formula are in relationships of 0.995?m?1.020, 0<x?0.15, and 0?y?1.00, a first sub ingredient including an oxide of R (where R is a rare earth element), a second sub ingredient including an oxide of Mg, and a third sub ingredient including an oxide of Mn, wherein the ratios of the sub ingredients with respect to 100 moles of the main ingredient are first sub ingredient: 0.1 to 6 moles (value converted to oxide of R), second sub ingredient: 0.1 to 5 moles (value converted to oxide of Mg), and third sub ingredient: 0.1 to 2.Type: GrantFiled: August 29, 2005Date of Patent: June 2, 2009Assignee: TDK CorporationInventors: Kazushige Ito, Akira Sato, Taku Murase
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Patent number: 7541103Abstract: A coated plastic substrate module (100) includes a plastic substrate (110), an organic coating (130), and a modulating film (120) sandwiched therebetween. The modulating film is made from partially stabilized zirconia. A method for manufacturing a coated plastic substrate module includes the following steps: providing a plastic substrate; forming a modulating film on the plastic substrate, the modulating film being made from partially stabilized zirconia; forming an organic coating on the modulating film; and annealing the treated plastic substrate having the modulating film and organic coating.Type: GrantFiled: December 29, 2005Date of Patent: June 2, 2009Assignee: Hon Hai Precision Industry Co., Ltd.Inventor: Charles Leu
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Publication number: 20090137381Abstract: The object of the present invention is to provide a method of production of dielectric ceramic composition which can lower the firing temperature without compensating the dielectric characteristics. The method of production according to the present invention is characterized by comprising steps of; preparing a dielectric oxide expressed by composition formula of [(CaxSr1-x)O]m[(TiyZr1-y-zHfz)O2] (x, y, z, and m in the formula are; 0.5?x?1.0, 0.01?y?0.10<z?0.20 and 0.90?m?1.04 respectively), mixing, with respect to 100 parts by weight of the dielectric ceramic composition, 1 to 10 parts by weight of a sintering aid and 0.1 to 1.5 parts by weight of sodium oxide, sodium carbonate or a mixture thereof in terms of Na2O, and firing an obtained mixture; wherein said sintering aid comprises, with respect to 100 wt % of said sintering aid, 30 to 69 wt % of manganese compound in terms of MnO, 1 to 20 wt % of aluminum oxide in terms of Al2O3, and 30 to 50 wt % of silicon oxide in terms of SiO2.Type: ApplicationFiled: November 7, 2008Publication date: May 28, 2009Applicant: TDK CORPORATIONInventors: Tetsuo Takaishi, Tomoaki Nonaka, Hiroshi Sasaki, Tsutomu Odashima, Kenta Iwasawa
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Patent number: 7538056Abstract: A translucent ceramic includes a perovskite-type compound as a main component having a composition represented by the general formula (La1-x(Sr1-a-bBaaCab)x)((Al1-cGac)1-y(Ta1-dNbd)y)vOw (wherein 0<x?1, 0<y?0.6, 0.4?y/x?0.6, 0?a?1, 0?b?1, 0?c?1, 0?d?1, 0.9?v?1.1 and w is a positive number for keeping an electrical neutrality). The translucent ceramic has a high refractive index and a large Abbe number. Therefore, the translucent ceramic has an advantage in correction of aberration and is preferably used for lenses, which are disposed so as to hold a diaphragm therebetween, in a Gauss lens optical system such as an optical system for a single-lens reflex camera.Type: GrantFiled: April 8, 2008Date of Patent: May 26, 2009Assignee: Murata Manufacturing Co., Ltd.Inventor: Yuji Kintaka
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Publication number: 20090124482Abstract: There is provided a high-frequency dielectric material that has a high relative permittivity, a high Q value, and a TCF property value close to zero (0) and can realize co-firing of the dielectric material with silver (Ag) and copper (Cu). The high-frequency dielectric material is characterized by comprising a composition of main constituent materials having a formulation of CaO: 1 mole, Nb2O5: (1??×?)/3 mole, ZnO: (1??)/3 mole, TiO2: ? mole, and Li2O: ?×(1??)/6 mole, wherein 0.65???0.75, 0.09???0.15, 0.066??×??0.100, and 0.15???0.35; and 1 to 5 parts by weight, based on 100 parts by weight of the composition of main constituent materials, of a sintering aid selected from the group consisting of oxides of copper (Cu), boron (B), lithium (Li), bismuth (Bi), and vanadium (V) and a mixture of two or more of the oxides.Type: ApplicationFiled: April 16, 2007Publication date: May 14, 2009Applicant: YOKOWO CO., LTD.Inventors: Takahiro Yamakawa, Shi Luo
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Publication number: 20090124483Abstract: A dielectric piece includes an energy barrier layer and a plurality of crystalline metal compound dots distributed in the energy barrier layer. The material of the crystalline metal compound dots is different from that of the energy barrier layer. Due to its capability of retaining charges, the dielectric piece of the present invention meets the requirements of semiconductor devices in this and the next generation so as to be applied to complementary metal oxide semiconductors (CMOS), non-volatile memory devices, or capacitors as inter-gate dielectric layers, charge storage layers, or dielectric layers of capacitors.Type: ApplicationFiled: January 19, 2009Publication date: May 14, 2009Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Cha-Hsin Lin, Pei-Jer Tzeng, Maikap Siddheswar
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Publication number: 20090118114Abstract: The present invention provides a functionally graded bioactive glass/ceramic composite structure or bioactive glass/ceramic/bioactive glass sandwich structure for use in such applications as damage resistant, ceramic dental implants, immediate tooth replacement, endodontic posts, orthopedic prostheses, orthopedic stems, bone substitutes, bone screws, plates, and anchors, nonunion fractures repair, alveolar ridge augmentation, missing small bone parts (e.g. fingers, toes, etc), maxilla facial reconstruction, spinal fusion, and scaffolds for bone regeneration, comprising a residual bioactive glass or glass-ceramic layer at all accessible surfaces, followed by an underlying graded glass-ceramic layer, and then an dense interior ceramic. The residual bioactive glass or glass-ceramic layer can be further transformed to a carbonate apatite (CHA) layer by immersing in calcifying solution or simulated body fluid (SBF) with electrolyte composition similar to that of serum.Type: ApplicationFiled: September 22, 2008Publication date: May 7, 2009Inventors: Yu Zhang, Racquel Regeros, Jae-Won Kim
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Publication number: 20090118115Abstract: TIO2 residues from a sulfate method are used in metallurgical processes or as a component of fireproof materials.Type: ApplicationFiled: December 15, 2008Publication date: May 7, 2009Inventor: Djamschid AMIRZADEH-ASL
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Publication number: 20090111680Abstract: ABSTRACT The invention intends to provide a dielectric porcelain composition for use in electronic devices which can be controlled in the temperature coefficient ?f in particular in a negative direction and can shorten a sintering period while maintaining a high Qf value and a high dielectric constant. According to the invention, in conventional composition having a composition formula represented by XBa(Mg1/3Ta2/3)O3-Y(BazSrl-z)(Ga1/2Ta1/2)O3, when Mg is substituted by Ni to form a specific structure, the temperature coefficient ?f can be controlled in a negative direction and the ?f can be controlled in the range of 0.80 to ?4.45 ppm/° C. while maintaining a high Qf value and a high dielectric constant, and even when a sintering period, which has been so far necessary substantially 50 hr, is reduced to 25 hr substantially one half the above, similar Qf value can be obtained.Type: ApplicationFiled: August 11, 2005Publication date: April 30, 2009Inventor: Takeshi Shimada
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Patent number: 7510669Abstract: A piezoelectric ceramic composition includes a bismuth layer compound containing at least Sr, Bi and Nb, e.g., (Sr0.9Nd0.1)Bi2Nb2O9, as a main component and 2 parts by weight or less (excluding 0 part by weight), preferably 0.04 part by weight to 0.5 part by weight, of Cu in terms of CuO relative to 100 parts by weight of the main component. From the viewpoint of improvement in sinterability, 0.1 part by weight to 2 parts by weight of Mn in terms of MnCO3 relative to 100 parts by weight of the main component is preferably contained. As a result, it is possible to obtain a piezoelectric ceramic composition resisting no deterioration in piezoelectricity even when a rapid temperature change occurs, and an advantageous piezoelectric component, such as a piezoelectric actuator or a piezoelectric resonator, manufactured using the piezoelectric ceramic composition.Type: GrantFiled: March 24, 2008Date of Patent: March 31, 2009Assignee: Murata Manufacturing Co., Ltd.Inventors: Hirozumi Ogawa, Masahiko Kimura, Kosuke Shiratsuyu