And Divalent Metal Oxide Other Than Alkaline Earth Oxide Or Magnesium Oxide Patents (Class 501/138)
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Publication number: 20030191011Abstract: A high permittivity dielectric ceramic composition wherein a main component includes BaTiO3: 74.24 to 79.97 mol %, BaZrO3: 5.69 to 12.04 mol %, CaTiO3: 7.84 to 12.13 mol %, MgTiO5: 3.11 to 4.72 mol % and Bi2TiO5: 0.10 to 0.60 mol %. With respect to 100 wt % of the main component, 0.1 or less (excepting 0) of NiO, 0.1 wt % or less (excepting 0) of CeO2 and 0.2 wt % or less (excepting 0) of MnO are included. In accordance with need, 0.2 wt % or less (excepting 0) of SiO2 is further included with respect to 100 wt % of the main component. A high relative permittivity, such as 9000 or more, a high AC breakdown voltage, and a small electrostatic capacity change rage with respect to temperature can be obtained.Type: ApplicationFiled: March 24, 2003Publication date: October 9, 2003Applicant: TDK CorporationInventors: Norio Sasaki, Yoshiharu Watanabe
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Patent number: 6631070Abstract: The invention relates to a ceramic capacitor having at least two electrodes and a ceramic dielectric of a dielectric, ceramic preparation which is essentially composed of an oxide-ceramic dielectric substance and a sintering agent including zinc borate Zn4B6O13.Type: GrantFiled: July 1, 2002Date of Patent: October 7, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Peter Schmidt, Detlev Hennings
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Publication number: 20030186802Abstract: A dielectric ceramic composition comprising a main component including a dielectric oxide expressed by a composition formula {(Ca1-xMex)O}m.(Zr1-yTiy)O2, and a first subcomponent including at least one of oxides selected from V, Nb, W, Ta, Mo and Cr and compounds which become an oxide of these after firing; wherein a symbol Me in the formula included in the main component is at least one of Sr, Mg and Ba, symbols m, x and y indicating composition mole ratios in the formula included in the main component are 0.8≦m≦1.3, 0≦x≦1.00 and 0.1≦y≦0.8, and a ratio of the first subcomponent to 100 moles of the main component is 0.01 atomic %≦the first subcomponent<5 atomic % in a conversion of metal element in an oxide.Type: ApplicationFiled: December 16, 2002Publication date: October 2, 2003Inventors: Yasuo Watanabe, Akira Sato
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Patent number: 6620753Abstract: A dielectric ceramic includes ABO3 as a major component and R and M as accessory components, where A is at least one of Ba, Sr and Ca; B is at least one of Ti, Zr and Hf; R is at least one of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y; and M is at least one of Ni, Co, Fe, Cr and Mn. The dielectric ceramic contains the components R and M at about 70% or more of analysis points in grain boundaries. This dielectric ceramic is suitable for use in dielectric ceramic layers of a multilayer ceramic capacitor obtained by firing in a reducing atmosphere, has a long life at high temperatures and high voltages, exhibits less time-dependent change in electrostatic capacity under application of a direct-current voltage and has satisfactory reliability even when its thickness is reduced.Type: GrantFiled: October 18, 2001Date of Patent: September 16, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Tomoyuki Nakamura, Kentaro Sakai, Harunobu Sano
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Patent number: 6620754Abstract: The ceramic capacitor in accordance with the present invention is fabricated by employing a dielectric ceramic composition in forming dielectric layers thereof, wherein the dielectric ceramic composition contains an oxide of Ba and Ti, an oxide of Re (Re used herein represents one or more rare-earth elements selected from Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Y), an oxide of Mg, one or more oxides selected from oxides of Mn, V and Cr, an oxide of Mo and/or W and SiO2 or a glass component including SiO2, wherein the amount of the oxide of Ba and Ti is 100 mol % in terms of BaTiO3, the amount of the oxide of Re is 0.25 to 1.5 mol % in terms of Re2O3, the amount of the oxide of Mg is 0.2 to 1.5 mol % in terms of MgO and the amount of one or more oxides of Mn, V or Cr is 0.03 to 0.6 mol % in terms of Mn2O3, V2O5, Cr2O3, respectively, and the amount of the oxide of Mo and/or W is 0.025 to 0.25 mol % in terms of MoO3 and WO3.Type: GrantFiled: June 29, 2001Date of Patent: September 16, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Youichi Mizuno, Hisamitsu Shizuno, Kenji Saito, Yasunobu Kawamoto
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Patent number: 6620755Abstract: A dielectric ceramic composition includes 100 mol % of an oxide of Ba, Ti and Zr, 0.25 to 1.5 mol % of an oxide of Re, Re representing one or more elements selected from the group consisting of Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Y, 0.1 to 0.4 mol % of an oxide of Mg, 0.03 to 0.6 mol % of oxides of one or more elements selected from the group consisting of Mn, V and Cr and 0.02 to 0.3 mol % of oxides of one or two elements of Mo and W. The ceramic composition further includes a glass component having SiO2 and x in the oxide of Ba(Ti1−xZrx)O3 ranges from about 0.05 to about 0.26.Type: GrantFiled: April 3, 2002Date of Patent: September 16, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Kenji Saito, Youichi Mizuno, Koichiro Morita, Yasunobu Kawamoto
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Patent number: 6617274Abstract: An electric-field-inducible deformable porcelain material is provided, comprising a main component BaTiO3, with 0.05 to 2 wt % of at least one selected from Mn, Cu and Co in terms of a metal added thereto. The crystal phase in the porcelain is a single perovskite phase, and the value of the transversal electric-field-inducible deformation is 300×10−6 or more in the field strength of 2000 V/mm. It is presumed that the amount of the rotating 90° domain becomes greater, and the electric-field-induced deformation due to this is increased. Thus, a sufficient displacement amount as a piezoelectric material is obtained.Type: GrantFiled: April 4, 2002Date of Patent: September 9, 2003Assignee: NGK Insulators, Ltd.Inventors: Hirofumi Yamaguchi, Toshikatsu Kashiwaya
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Patent number: 6613706Abstract: A dielectric ceramic composition includes sintered ceramic grains having a core-shell structure, wherein 50%˜80% of the grains have a domain width of twin smaller than 20 nm; not greater than 30% of the grains have a domain width of twin in the range from 20 nm to 50 nm; not smaller than 10% of the grains have a domain width of twin greater than 50 nm or have no twin.Type: GrantFiled: May 24, 2002Date of Patent: September 2, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Tomoya Hagiwara, Koichiro Morita, Youichi Mizuno
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Patent number: 6613705Abstract: Reduction-stable COG ceramic compounds having a high dielectric constant, particularly for multi-layer capacitors or LC filters with Cu electrodes, on the basis of the material system BaO—Nd2O3—Sm2O3—TiO2 in the region of the phase formation of rhombic bronzes with additives of a glass frit from the systems: (A) ZnO—B2O3—SiO2, (B) K2O—Na2O—BaO—Al2O3—ZrO2—ZnO—SiO2—B2O3 or (C) Li2O—BaO—B2O—SiO2, have the general formula BaII6−x(SmyNd1−y)8+2x/3Ti18O54+p wt. % glass frit with 1<x<2, 0.5<y<1.0 and 3<p<10.Type: GrantFiled: May 21, 2001Date of Patent: September 2, 2003Assignee: Epcos AktiengesellschaftInventors: Addalbert Feltz, Andreas Webhofer, Klaus-Dieter Aichholzer
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Publication number: 20030158032Abstract: A dielectric ceramic composition comprising a main component of BaTiO3, a first subcomponent including at least one compound selected from MgO, CaO, BaO, SrO and Cr2O3, a second subcomponent of (Ba, Ca)xSiO2+x (where, x=0.8 to 1.2), a third subcomponent including at least one compound selected from V2O5, MoO3, and WO3, and a fourth subcomponent including an oxide of R1 (where R1 is at least one element selected from Sc, Er, Tm, Yb, and Lu), a fifth subcomponent including an oxide of R2 (where R2 is at-least one element-selected from Y, Dy, Ho, Tb, Gb and Eu), wherein the ratios of the subcomponents to 100 moles of the main component of BaTiO3 are first subcomponent of 0.1 to 3 moles, second subcomponent of 2 to 10 moles, third subcomponent of 0.01 to 0.5 mole, fourth subcomponent of 0.5 to 7 moles, and fifth subcomponent of 2 to 9 moles (where the number of moles of the fourth and fifth subcomponents are respectively the ratio of R1 and R2 alone).Type: ApplicationFiled: February 20, 2003Publication date: August 21, 2003Applicant: TDK CORPORATIONInventors: Yoshinori Fujikawa, Yoshihiro Terada, Shigeki Sato
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Patent number: 6606238Abstract: A conductive paste contains a ceramic powder in addition to a conductive metal powder and an organic vehicle. The ceramic powder is a powder produced by calcining an ABO3 system in which A represents Ba or alternatively Ba partially substituted by at least one of Ca and Sr, and B represents Ti or alternatively Ti partially substituted by at least one of Zr and Hf, the system containing at least one selected from the group of consisting of Re compounds (La or the like), Mg compounds, and Mn compounds. The ceramic powder has an average grain size smaller than that of the metal powder and being incapable of sintering at the sintering temperature of the substrate-use ceramic.Type: GrantFiled: October 7, 2002Date of Patent: August 12, 2003Assignee: Murata Manufacturing Co. LtdInventors: Tomoyuki Nakamura, Motohiro Shimizu, Harunobu Sano
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Publication number: 20030146406Abstract: A piezoelectric/electrostrictive material is made of a BaTiO3-based porcelain composed mainly of BaTiO3, and a strain (S4000) of transversal direction is 650×10−6 or more in an electric field of 4,000 V/mm. This porcelain has a Curie temperature of 110 to 130° C., and its crystal phase at ambient temperature consists essentially of tetragonal and cubic phases. The piezoelectric/electrostrictive material being composed of this porcelain is superior in strain to conventional products, and can be suitably used in an actuator or a sensor.Type: ApplicationFiled: December 19, 2002Publication date: August 7, 2003Applicant: NGK Insulators, Ltd.Inventors: Hirofumi Yamaguchi, Takaaki Koizumi
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Patent number: 6599855Abstract: A nonreducing dielectric ceramic contains a tungsten-bronze-type crystal phase including at least Ba, RE and Ti as elements, and a pyrochlore-type crystal phase including at least RE and Ti as elements, where RE is at least one rare-earth element. The relationship 0.10≦b/(a+b)≦0.90 is satisfied, where a is the maximum peak intensity assigned to the tungsten-bronze-type crystal phase and b is the maximum peak intensity assigned to the pyrochlore-type crystal phase determined by X-ray diffractometry. A ceramic electronic component includes an electronic component body composed of the nonreducing dielectric ceramic and a conductor in contact with the nonreducing dielectric ceramic.Type: GrantFiled: January 3, 2002Date of Patent: July 29, 2003Assignee: Murata Manufacturing Co., Ltd.Inventor: Masahiro Naito
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Patent number: 6599447Abstract: A Zr-doped (Ba,Sr)TiO3 perovskite crystal material dielectric thin film. Such dielectric thin film is characterized by at least one of the characteristics including: (a) a breakdown strength of at least 1.3 MV/cm; (b) a leakage current of not more than 1×10−3 A/cm2 under applied voltage of about ±3V or above and at temperature of about 100° C. or above; and (c) an energy storage density of at least 15 J/cc. The dielectric thin film comprises zirconium dopant in the amount of 0.5% to 50% by total weight of the Zr-doped (Ba,Sr)TiO3 perovskite crystal material, preferably 2-15%, more preferably 4% to 14%, and most preferably 5% to 12%. Such dielectric thin film in a preferred aspect is deposited by a MOCVD process using metal precursors Ba(thd)2-polyamine, Sr(thd)2-polyamine, Zr(thd)4, and Ti(OiPr)2(thd)2 at a deposition temperature in the range from about 560° C. to 700° C.Type: GrantFiled: November 29, 2000Date of Patent: July 29, 2003Assignee: Advanced Technology Materials, Inc.Inventors: Gregory T. Stauf, Philip S. Chen, Jeffrey F. Roeder
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Publication number: 20030134738Abstract: Provided is a piezoelectric ceramic capable of improving its piezoelectric properties. The piezoelectric ceramic comprises a rhombohedral perovskite structure compound such as (Na0.5Bi0.5)TiO3, a tetragonal perovskite structure compound such as BaTiO3 and (K0.5Bi0.5)TiO3 and an orthorhombic perovskite structure compound such as NaNbO3, KNbO3 and CaTiO3, or the rhombohedral perovskite structure compound, the tetragonal perovskite structure compound and a cubic perovskite structure compound such as SrTiO3. Three kinds of perovskite structure compounds having different crystal structures are comprised, so that the piezoelectric properties can be improved. The three kinds of compounds may perfectly form a solid solution or not.Type: ApplicationFiled: July 16, 2002Publication date: July 17, 2003Inventors: Masahito Furukawa, Kenji Horino, Shogo Murosawa, Yoshiko Gokita
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Publication number: 20030119656Abstract: The production of low-loss, tunable composite ceramic materials with improved breakdown strengths is disclosed. The composite materials comprise ferroelectric perovskites such as barium strontium titanate or other ferroelectric perovskites combined with other phases such as low-loss silicate materials and/or other low-loss oxides. The composite materials are produced in sheet or tape form by methods such as tape casting. The composite tapes exhibit favorable tunability, low loss and tailorable dielectric properties, and can be used in various microwave devices.Type: ApplicationFiled: November 22, 2002Publication date: June 26, 2003Applicant: Paratek Microwave, Inc.Inventors: Luna H. Chiu, Xubai Zhang, Louise C. Sengupta
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Publication number: 20030114295Abstract: A piezoelectric/electrostrictive material is made of a BaTiO3-based porcelain composed mainly of BaTiO3 and containing CuO and Nb2O5. 85% or more of the crystal grains constituting the porcelain are grains having particle diameters of 10 &mgr;m or less and the maximum particle diameters of the grains are in a range of 5 to 25 &mgr;m. This BaTiO3-based piezoelectric/electrostrictive material is superior in piezoelectric/electrostrictive properties to conventional products and can be suitably used in an actuator or a sensor.Type: ApplicationFiled: May 20, 2002Publication date: June 19, 2003Applicant: NGK Insulators, Ltd.Inventors: Hirofumi Yamaguchi, Takaaki Koizumi
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Patent number: 6579468Abstract: A piezoelectric ceramic composition contains a compound containing Na, Li, Nb and O, and having a perovskite structure, as a main component. The main component has a crystal phase in a semi-stable state at room temperature, such crystal phase originally not being stable at room temperature but being stable at a higher temperature.Type: GrantFiled: May 29, 2002Date of Patent: June 17, 2003Assignee: Murata Manufacturing Co. Ltd.Inventors: Masahiko Kimura, Akira Ando, Tomoyuki Ogawa
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Patent number: 6569795Abstract: A high-frequency dielectric ceramic compact is provided which has a relative dielectric constant (∈r) of about 20 or less and a Q value of about 20,000 or more at 1 GHz, in which the temperature coefficient (&tgr;f) can be optionally controlled at about 0 (ppm/° C.). When the compact of the dielectric ceramic compact is represented by the formula aBaO.bMeO.cSbO3/2, 0.476≦a≦0.513, 0.160≦b≦0.175, and 0.324≦c≦0.350. In addition, when the compact of the dielectric ceramic compact is represented by the formula dBaO.eMeO.fSbO3/2.gTiO2, 0.476≦d≦0.513, 0.100≦e≦0.175, 0.200≦f≦0.349, and 0<g≦0.200.Type: GrantFiled: June 28, 2001Date of Patent: May 27, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Mizuki Kono, Tsutomu Tatekawa, Hitoshi Takagi
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Patent number: 6559084Abstract: A dielectric ceramic composition comprising a main component of BaTiO3, a first subcomponent including at least one compound selected from MgO, CaO, BaO, SrO and Cr2O3, a second subcomponent of (Ba, Ca)xSiO2+x (where, x=0.8 to 1.2), a third subcomponent including at least one compound selected from V2O5, MoO3, and WO3, and a fourth subcomponent including an oxide of R1 (where R1 is at least one element selected from Sc, Er, Tm, Yb, and Lu), a fifth subcomponent including an oxide of R2 (where R2 is at least one element selected from Y, Dy, Ho, Tb, Gb and Eu), wherein the ratios of the subcomponents to 100 moles of the main component of BaTiO3 are first subcomponent of 0.1 to 3 moles, second subcomponent of 2 to 10 moles, third subcomponent of 0.01 to 0.5 mole, fourth subcomponent of 0.5 to 7 moles, and fifth subcomponent of 2 to 9 moles (where the number of moles of the fourth and fifth subcomponents are respectively the ratio of R1 and R2 alone).Type: GrantFiled: July 18, 2000Date of Patent: May 6, 2003Assignee: TDK CorporationInventors: Yoshinori Fujikawa, Yoshihiro Terada, Shigeki Sato
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Patent number: 6559083Abstract: The present invention provides a dielectric ceramic composition comprising a base material represented by the general formula: (x) Al2O3+(y) TiO2, where x and y are percentages of the total weight of the base material, with x being in the range of about 60 to about 96 and y being in the range of about 4 to about 40. Also provided is a first additive material comprising Nb2O5 and a second additive material comprising BaZrO3. In another embodiment the present invention provides a sintered dielectric ceramic composition comprising a base material represented by the general formula: (x) Al2O3+(y) TiO2, where x and y are percentages of the total weight of the base material, with x being in the range of about 60 to about 96 and y being in the range of about 4 to about 40. Also provided is a first additive material comprising Nb2O5 and a second additive material comprising BaZrO3.Type: GrantFiled: April 17, 2001Date of Patent: May 6, 2003Assignee: CTS CorporationInventors: Jeffrey R. Jacquin, Randy E. Rose
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Patent number: 6558567Abstract: Provided is a piezoelectric ceramic compact useful as a material for a piezoelectric ceramic compact device or the like, having SrBi4Ti4O15 as a main component, containing no or a small amount of lead or lead compound, and exhibiting a Qmax improved to a level permitting practical use application. The piezoelectric ceramic compact includes a bismuth layer compound as a main component composed of Sr, Bi, Ti and oxygen, and when the molar ratio of Sr, Bi and Ti of the bismuth layer compound as the main component is a:b:c, the relations of 0.13≦a/c<0.25 and 3.5≦(2a+3b)/c≦3.75 are satisfied.Type: GrantFiled: May 18, 2001Date of Patent: May 6, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Masahiko Kimura, Takuya Sawada, Akira Ando
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Patent number: 6556423Abstract: A dielectric ceramic has a ceramic structure of crystal grains and grain boundaries between the crystal grains. The crystal grains are of a main component represented by the formula ABO3 and an additive containing a rare earth element wherein A is at least one of barium, calcium, and strontium, barium being an essential element, and B is at least one of titanium, zirconium, and hafnium, titanium being an essential element. The average rare earth element concentration in the interior of the crystal grains is about 50% or less the average rare earth element concentration at the grain boundaries. Furthermore, about 20% to 70% of the crystal grains have a rare earth element concentration in the center of the crystal grain of at least about {fraction (1/50)} the maximum rare earth element concentration in a region extending inward from the surface by a distance corresponding to about 5% of the diameter of the crystal grain.Type: GrantFiled: March 7, 2002Date of Patent: April 29, 2003Assignee: Murata Manufacturing Co. Ltd.Inventors: Hiroyasu Konaka, Tomoyuki Nakamura, Toshihiro Okamatsu, Harunobu Sano
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Patent number: 6556422Abstract: A dielectric ceramic composition, a multi-layer ceramic capacitor and a manufacturing method characterized by superior dielectric properties. The ceramic capacitor includes a chip having a plurality of dielectric layers, a plurality of internal electrodes stacked alternately with the dielectric layers, and a pair of outer electrodes formed on both sides of the chip, with the composition of the dielectric layers including: 100 moles of barium calcium titanate BaCaxTiO3 (0.001≦x≦0.02), 0.5-4 moles of MgO, 0.01-0.5 moles of MnO, 0.1—2 moles of BaO, 0.1-2 moles of CaO, 1-4 moles of SiO2, and 0.1-3 moles of at least one or more compounds selected from the group consisting of Y2O3, Dy2O3, Ho203 and Er2O3. The capacitor thus manufactured satisfies the X7R standard and has superior dielectric properties, and the deviations of the dielectric properties are extremely low, thereby ensuring a high reliability.Type: GrantFiled: May 18, 2001Date of Patent: April 29, 2003Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Han Gyun Kim, Seong Won Cho, Seong Un Ma, Kang Heon Her, Jong Yeon Lee
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Patent number: 6534430Abstract: A sensor material for measuring physical parameters capable of configuring a sensor capable of directly measuring a high value of physical parameters such as high stress or high pressure without employing a pressure resistance container. The sensor material for measuring static and dynamic physical parameters includes a matrix made of an electrically insulating ceramic material, and piezoresistance materials which are dispersed in the matrix so as to be electrically continuous to each other.Type: GrantFiled: February 27, 2001Date of Patent: March 18, 2003Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Hiroaki Makino, Mitsuru Asai, Nobuo Kamiya, Shin Tajima, Katsunori Yamada, Hiroshi Hohjo
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Patent number: 6534429Abstract: A multi-component material is represented by the general formula (I): Ba(1−y−y)PbyMxTiO3 (I) in which: M is Sr or Cd; x is the decimal fraction molar concentration of MTiO3, where x has a value equal to or greater than about 0.20 and less than or equal to about 0.75; and y is the decimal fraction molar concentration of PbTiO3, where y has a value greater than zero and less than or equal to about 0.40, and x+y is less than 1.0. In addition, a method of graphically estimating the composition of the multi-component material represented by the general formula (I) is disclosed herein. In a preferred embodiment, x has a value between about 0.28 and 0.66, and y has value greater than zero and less than or equal to about 0.34, while said material has a Curie point temperature of about 25° C. or room temperature. These room temperature Curie point materials are useful in uncooled thermal imaging applications.Type: GrantFiled: March 20, 2000Date of Patent: March 18, 2003Assignee: The United States of America as represented by the Secretary of the ArmyInventor: David A. Jackson
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Patent number: 6528445Abstract: Disclosed is a dielectric ceramic composition suitable for use in planar or multilayer type electronic parts containing inner conductors, for the fabrication of which simultaneously sintering base materials and conductors is required.Type: GrantFiled: January 22, 2001Date of Patent: March 4, 2003Inventors: Kug Sun Hong, Jung-Kun Lee, Dong-Wan Kim, Hyun-Woo Jung, Jeong-Ryeol Kim, Sang-Gu Kang, Do-Kyun Kwon
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Patent number: 6524983Abstract: The ceramic capacitor in accordance with the present invention is fabricated by employing a dielectric ceramic composition in forming dielectric layers thereof, wherein the dielectric ceramic composition contains an oxide of Ba and Ti, an oxide of Re (Re used herein represents one or more rare-earth elements selected from Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Y) and one or more oxides selected from oxides of Mn, V and Cr, wherein the amount of the oxide of Ba and Ti is 100 mol % in terms of BaTiO3, the amount of the oxide of Re is 0.25 to 1.5 mol % in terms of Re2O3 and the amount of one or more oxides of Mn, V or Cr is 0.03 to 0.6 mol % in terms of Mn2O3, V2O5, Cr2O3, respectively, wherein the ratio of Ba to Ti ranges between 0.970 and 1.030.Type: GrantFiled: June 29, 2001Date of Patent: February 25, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Yasunobu Kawamoto, Koichiro Morita, Kenji Saito, Hisamitsu Shizuno
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Patent number: 6522521Abstract: A dielectric ceramic compact is provided which can decrease loss and heat generation under high frequency and high voltage or large current conditions, which exhibits a stable insulating resistance by AC or DC loading, and which can form a laminated ceramic capacitor using nickel or the like as an internal electrode material. The reduction-resistant dielectric ceramic compact is formed of an auxiliary sintering agent and a solid solution containing barium titanate as a primary component represented by the formula ABO3+aR+bM, where R is a compound containing an element such as La, and M is a compound containing an element such as Mn. In addition, 1.000<A/B≦1.035, 0.005≦a≦0.12, and 0.005≦b≦0.12. Furthermore, in the ceramic, the crystalline axis ratio c/a obtained by x-ray diffraction in a temperature range of −25° C. or above satisfies 1.000≦c/a≦1.Type: GrantFiled: July 31, 2001Date of Patent: February 18, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Shinobu Mizuno, Hisashi Miki, Harunobu Sano
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Patent number: 6517931Abstract: The present invention provides an electrode ink composition and a method of using the same. The ink comprises a silver powder, a vehicle and an inhibitor. The silver powder is preferably free of palladium and gold and comprises particles having a maximum particle size of less than or equal to about 1 &mgr;m. The inhibitor comprises a powdered ceramic metal oxide composition comprising particles having a maximum particle size of less than or equal to about 0.9 &mgr;m.Type: GrantFiled: October 15, 2001Date of Patent: February 11, 2003Assignee: Ferro CorporationInventor: Bo Fu
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Patent number: 6514895Abstract: The present invention relates to electronically tunable dielectric materials which have favorable properties for many applications, including the area of radio frequency (RF) engineering and design. The electronically tunable materials include an electronically tunable dielectric phase such as barium strontium titanate in combination with a metal silicate phase such as Mg2SiO4. The electronically tunable materials may be provided in bulk, thin film and thick film forms for use in devices such as phased array antennas, tunable filters and the like.Type: GrantFiled: June 15, 2000Date of Patent: February 4, 2003Assignee: Paratek Microwave, Inc.Inventors: Luna H. Chiu, Xubai Zhang, Louise Sengupta
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Patent number: 6507477Abstract: An electrical capacitor is discloses which includes a mixture of electrically conductive and non-conductive particles. The particles are intimately mixed so as to provide a random distribution, and the mixture is placed between two parallel conductive plates to which electrical leads are attached and pressure is applied.Type: GrantFiled: September 11, 2000Date of Patent: January 14, 2003Inventor: John E. Stauffer
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Patent number: 6503861Abstract: There is provided a dielectric ceramic composition wherein a main crystal phase is a perovskite-type crystal phase, comprising a complex oxide which contains, as a metal element, at least a rare earth element, Al, M (M is Sr, alternatively, Sr and Ca) and Ti, and is represented by the following composition formula: aLn2OxbAl2O3cMOdBaOeTiO2 wherein Ln is a rare earth element; and a, b, c, d and e is a mole ratio in a predetermined range, and more specifically comprising a solid solution of LnAlO(x+3)/2 (3≦x≦4) and RTiO3 (R is an alkaline earth metal containing at least Sr). This composition provides a large dielectric constant ∈r and a high Q value in a high frequency region, and also lessens the variation in dielectric constant ∈r, Q value, and resonance frequency temperature coefficient &tgr;f.Type: GrantFiled: January 12, 2000Date of Patent: January 7, 2003Assignee: Kyocera CorporationInventors: Shunichi Murakawa, Yoshihiro Okawa
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Publication number: 20030001131Abstract: A lead-free piezoelectric ceramic material is provided having a high piezoelectric strain constant (d33) and exhibiting excellent heat resistance. The material is particularly suitable for producing knock sensor elements, i.e., sensor elements for sensing engine knock. The piezoelectric ceramic material contains three components, BNT (bismuth sodium titanate, (Bi0.5Na0.5)TiO3), BT (barium titanate, BaTiO3) and BKT (bismuth potassium titanate, (Bi0.5K0.5)TiO3), and preferably has a tetragonal perovskite-type crystal structure.Type: ApplicationFiled: May 15, 2001Publication date: January 2, 2003Inventors: Masanori Takase, Kazushige Ohbayashi
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Publication number: 20020183190Abstract: The invention provides a dielectric ceramic composite that can be burnt at a low temperature. The dielectric ceramic composite in accordance with the invention is produced by means of adding eight kinds of chemical compounds of ZnO, SiO2, CuO, Al2O3, MgO, BaCO3, B2O3 to (BaNdSm)TiO3 and then wet-mixing them for three hours.Type: ApplicationFiled: January 24, 2002Publication date: December 5, 2002Inventors: Hitoshi Masumura, Masatoshi Kobayashi
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Patent number: 6487065Abstract: A multilayer ceramic capacitor comprises a sintered ceramic compact including primary crystalline phases and secondary phases. The primary crystalline phases mainly contain CaTiO3 and CaZrO3. The secondary phases mainly contain Si and Ca. The amount of Ca in the secondary phase is about 30 mol % or less.Type: GrantFiled: March 4, 2002Date of Patent: November 26, 2002Assignee: Murata Manufacturing Co. Ltd.Inventors: Takayuki Nishino, Toshiki Nishiyama, Yasunobu Yoneda
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Patent number: 6479419Abstract: A dielectric ceramic composition comprising as main components barium titanate and a component M (wherein M is at least one type of component selected from manganese oxide, iron oxide, cobalt oxide, and nickel oxide) and having a ferroelectric phase region, wherein the concentration of the component M in the ferroelectric phase region changes from the outside toward the center. The concentration of the component M in the ferroelectric phase region is higher at the outside compared with near the center of the ferroelectric phase region. It is possible to realize a multi-layer capacitor which can satisfy both of the X7R characteristic (EIA standard) and B characteristic (EIAJ standard) of the temperature characteristic of the electrostatic capacity, has little voltage dependency of the electrostatic capacity and the insulation resistance, is superior in insulation breakdown resistance, and can use Ni or a Ni alloy as the internal electrode layer.Type: GrantFiled: December 21, 2000Date of Patent: November 12, 2002Assignee: TDK CorporationInventor: Takeshi Masuda
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Patent number: 6458734Abstract: A dielectric ceramic compact is provided which can be obtained by sintering at a low temperature of 1000° C. or less, can be obtained by co-sintering a dielectric ceramic composition with a metal having superior electrical conductivity, such as Ag, and has a high relative dielectric constant, a high Q and a small temperature coefficient of dielectric properties. The dielectric ceramic composition combines an xBaO-yTiO2-zReO3/2 ceramic composition and a glass composition; wherein 8≦x≦18, 52.5≦y≦65, 20≦z≦40, in which x, y, and z represent mole percent, x+y+z=100 and Re indicates a rare earth element, and the glass composition comprises about 10 to 25 wt % of SiO2, about 10 to 40 wt % of B2O3, about 25 to 55 wt % of MgO, 0 to about 20 wt % of ZnO, 0 to about 15 wt % of Al2O3, about 0.5 to 10 wt % of Li2O and 0 to about 10 wt % of RO in which R is at least one selected from the group consisting of Ba, Sr and Ca.Type: GrantFiled: July 20, 2001Date of Patent: October 1, 2002Assignee: Murata Manufacturing Co. Ltd.Inventors: Yasutaka Sugimoto, Osamu Chikagawa, Naoya Mori
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Patent number: 6455454Abstract: Provided is a semiconductor ceramic and a semiconductor ceramic element each having a room temperature specific resistance of 3 &OHgr;·cm or lower and a resistance temperature characteristic of 9%/° C. or more. The semiconductor ceramic is characterized in that the ratio R1/(R1+R2), in which R1 is the transgranular resistance value of the crystal particles and R2 is the intergranular resistance value of the crystal particles and R1+R2 is the overall resistance value representing the sum of R1 and R2, is about 0.35 to 0.85.Type: GrantFiled: April 28, 2000Date of Patent: September 24, 2002Assignee: Murata Manufacturing Co. Ltd.Inventors: Yasuhiro Nabika, Tetsukazu Okamoto, Toshiharu Hirota
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Patent number: 6429163Abstract: The present invention provides a dielectric ceramic composition, a capacitor using the composition and the producing method, of having a lower dielectric loss and a stable characteristics in high frequency bandwidth, and enabling to use a base metal or a carbon-based material as an electrode material by allowing sintering at a low temperate, thereby resulting in lower cost. The dielectric ceramic composition according to present invention, is characterized in comprising a main component of formula SrxBa1−x(ZryTi1−y) O3 (where 0.8≦x≦1; 0.9≦y≦1) to which MnO2 of 0.05-15 wt %, at least one of 0.001-5 wt % selected from the group consisting of Bi2O3PbO and Sb2O3 and a glass component of 0.5-15 wt % are added based on the weight of the main component.Type: GrantFiled: March 30, 2001Date of Patent: August 6, 2002Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Jong Hee Kim, Shigehiro Fujino, Nobutake Hirai
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Patent number: 6429164Abstract: A ceramic composition includes 100 parts by weight of a main component of the formula: xBaO-y{(1−&agr;)Sm2O3-&agr;Nd2O3}-zTiO2, and as secondary components, about 0.3 part by weight or less of a Mn compound in terms of MnO and about 1 part by weight or less of a Ta compound in terms of Ta2O5, wherein 13≦x≦23; 0<y≦12; 75≦z≦83; 0≦&agr;≦1; and x+y+z=100. Further, about 1.5% by mole or less o3f the Ti element is preferably replaced with Zr. The resulting high frequency dielectric ceramic composition has a high relative dielectric constant (∈r) and a high Q value in a microwave region, can control the temperature coefficient of resonant frequency (&tgr;f) in the vicinity of zero (ppm/°C.), and has a satisfactory thermal shock resistance.Type: GrantFiled: October 27, 2000Date of Patent: August 6, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Takaya Wada, Nobuyuki Sakai, Hitoshi Takagi
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Patent number: 6426017Abstract: The piezoelectric ceramic composition of the present invention contains, as a main component, a material having a composition represented by Formula: CaMXBi4−xTi4−X(Nb1−ATaA)XO15, where M is at least one element selected from the group consisting of Ca, Sr, and Ba; 0.0≦A≦1.0; and 0.0≦X≦0.6.Type: GrantFiled: February 26, 2001Date of Patent: July 30, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Keiichi Takahashi, Masamitsu Nishida, Hiroshi Sogou
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Patent number: 6426018Abstract: The present invention provides a piezoelectric ceramic composition which contains no lead and has piezoelectric characteristics suitable for practical use. The piezoelectric ceramic composition has a complex perovskite structure represented by the formula: (1−x−y−z)BaTiO3-x(Bi1/2Na1/2)TiO3-yCaTiO3-zBa (Zn1/3Nb2/3)O3 and comprises Ba, Ti, O, Bi, Na, Ca, Zn and Nb in the proportion satisfying the following conditions of x, y and z: 0.0<x≦0.90, 0.0≦y≦0.20, and 0.0≦z≦0.05.Type: GrantFiled: November 20, 2001Date of Patent: July 30, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Keiichi Takahashi, Masamitsu Nishida
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Patent number: 6411495Abstract: The present invention provides a dielectric ceramic composition whose electrostatic capacity has an excellently low temperature dependence; which can be fired in a reducing atmosphere; and which is advantageously used in a laminated ceramic capacitor having an internal electrode formed of a base metal such as nickel or nickel alloy. The dielectric ceramic composition is represented by the following formula: {Ba1-xCaxO}mTiO2+&agr;MgO+&bgr;MnO, wherein 0.001≦&agr;≦0.05; 0.001≦&bgr;≦0.025; 1.000<m≦1.035; and 0.02≦x≦0.15.Type: GrantFiled: February 2, 2001Date of Patent: June 25, 2002Assignee: Murata Manufacturing Co. Ltd.Inventors: Nobuyuki Wada, Jun Ikeda, Takashi Hiramatsu, Yukio Hamaji
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Patent number: 6399529Abstract: An electric-field-inducible deformable porcelain material is provided, comprising a main component BaTiO3, with 0.05 to 2 wt % of at least one selected from Mn, Cu and Co in terms of a metal added thereto. The crystal phase in the porcelain is a single perovskite phase, and the value of the transversal electric-field-inducible deformation is 300×10−6 or more in the field strength of 2000 V/mm. It is presumed that the amount of the rotating 90° domain becomes greater, and the electric-field-induced deformation due to this is increased. Thus, a sufficient displacement amount as a piezoelectric material is obtained.Type: GrantFiled: June 7, 2000Date of Patent: June 4, 2002Assignee: NGK Insulators, Ltd.Inventors: Hirofumi Yamaguchi, Toshikatsu Kashiwaya
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Patent number: 6396681Abstract: A nonreducing dielectric contains a main-component having a perovskite crystal phase and satisfying the formula (Ca1-a-b-cSraBabMgc)m(Zr1-w-x-y-zTiwMnxNiyHfz)O3 and a compound oxide represented by the formulae (Si, T)O2—MO—XO and (Si, T)O2—(Mn, M′)O—Al2O3. The ratio of the intensity of the maximum peak of a crystal phase not of the perovskite crystal phase to the intensity of the maximum peak assigned to the perovskite crystal phase appearing at 2&thgr;=25 to 35° is about 5% or less in a CuK&agr; X-ray diffraction pattern.Type: GrantFiled: April 6, 2001Date of Patent: May 28, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Masahiro Naito, Tomoo Motoki, Harunobu Sano
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Publication number: 20020058580Abstract: A dielectric ceramic powder and multilayer ceramic capacitors made from the powders are disclosed. A dielectric start powder mixture includes at least ninety weight percent essentially pure barium titanate powder having an average particle size of from 0.2 to 1.2 microns; from 0.2 to 2.5 weight percent of barium lithium borosilicate; from 0.1 to 0.3 weight percent of MnCO3; 0.4 to 1.50 weight percent Nb205 or a niobate compound, or a molar equivalent of Ta2O5 or a tantalum compound as a grain growth inhibitor; and, 0.4 to 1.2 weight percent of gadolinium oxide (Gd2O3). The start powder mixture is calcined and then sintered in an open zirconia setter at from 950° C. to 1,025° C. to produce a dielectric ceramic body that satisfies X7R capacitor performance characteristics; that includes no hazardous heavy metal oxides; and, that may include silver-palladium electrodes having 85 weight percent or more of silver.Type: ApplicationFiled: December 29, 2001Publication date: May 16, 2002Inventors: Galeb H. Maher, Samir Maher
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Patent number: 6385035Abstract: A dielectric ceramic composition comprises 100 parts by weight of a primary constituent, about 0.1 to 25 parts by weight of a first secondary constituent comprising a SiO2-based glass not containing lead oxide, and about 20 parts by weight or less of a second secondary constituent comprising manganese oxide (MnO). The primary constituent is represented by the formula x(Ba&agr;Ca&bgr;Sr&ggr;)O-y[(TiO2)1−m(ZrO2)m]-zRe2O3 wherein x+y+z=100 on a molar basis, &agr;+&bgr;+&ggr;=1, 0≦&bgr;+&ggr;≦0.8, 0<m<0.15, and Re is at least one rare earth element. The mole fraction (x, y, z) of (Ba&agr;Ca&bgr;Sr&ggr;)O, (TiO2)1−m(ZrO2)m, and Re2O3 lies within a range surrounded by points in a ternary diagram, depending on the content of the ceramic capacitors. The dielectric ceramic composition can be sintered at low temperatures and exhibits a high specific dielectric constant and a high Q value.Type: GrantFiled: September 7, 2000Date of Patent: May 7, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroaki Matoba, Harunobu Sano
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Patent number: 6380118Abstract: A nonlinear dielectric ceramic having the D-E hysteresis characteristics contains a barium titanate-based compound as a principal constituent and a nonreducing oxide glass as a secondary constituent, and thus the nonlinear dielectric ceramic has reduction resistance. A pulse generating capacitor including the nonlinear dielectric ceramic, a high-pressure vapor discharge lamp circuit including the pulse generating capacitor, and a high-pressure vapor discharge lamp including the pulse generating capacitor are also disclosed.Type: GrantFiled: December 20, 1999Date of Patent: April 30, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Kazuhiro Harada, Harunobu Sano
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Patent number: 6380116Abstract: A dielectric ceramic composition comprises a compound oxide comprising barium titanate BamTiO3 as a major component and RO3/2, CaO, MgO, and SiO2, as accessory components, wherein R is at least one element selected from the group consisting of Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb, wherein the compound oxide satisfies the following relationship: 100BamTiO3+aRO3/2+bCaO+cMgO+dSiO2, wherein, on a molar basis, 0.990≦m≦1.030, 0.5≦a≦6.0, 0.10≦b≦5.00, 0.010≦c<1.000, and 0.05 ≦d<2.00. The dielectric ceramic composition satisfies the B characteristic defined by the Japanese Industrial Standard (JIS) and the X7R characteristic defined by the EIA standard with respect to dependence of electrostatic capacitance on temperature, and has a large CR product of the insulation resistance and the electrostatic capacitance. A monolithic ceramic capacitor which includes thin dielectric layers composed of this dielectric ceramic composition is highly reliable.Type: GrantFiled: July 26, 2000Date of Patent: April 30, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Toshihiro Okamatsu, Tomoyuki Nakamura, Kenji Hori, Kotaro Hata, Harunobu Sano