Lead, Zirconium, Titanium Or Compound Thereof Containing Patents (Class 252/62.9PZ)
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Publication number: 20040087432Abstract: Provided are a piezoelectric ceramic and a piezoelectric device having a larger piezoelectric strain constant and capable of being fired at a lower temperature. A main component of PbA[(Mg1/3Nb2/3)a(Zn1/3Nb2/3)bTicZrd]O3 (a+b+c+d=1, 0.99≦A≦1.01, 0.15≦a+b≦0.5, 0.05≦b≦0.25, 0.2≦c≦0.5, 0.15≦d≦0.6) and 0.01 mass % to 0.8 mass % inclusive of at least one kind selected from the group consisting of Fe, Co, Ni and Cu in the form of oxide per 1 mol of the main component as a first sub-component are comprised. Thereby, a larger piezoelectric strain constant can be obtained, and a firing temperature can be reduced. In the main component, a part of Pb may be replaced with at least one kind selected from the group consisting of Ca, Sr and Ba. Further, as a second sub-component, 0.05 mass % to 1.0 mass % inclusive of at least one kind selected from the group consisting of Sb, Nb and Ta in the form of oxide per 1 mol of the main component may be comprised.Type: ApplicationFiled: September 16, 2003Publication date: May 6, 2004Inventor: Satoshi Sasaki
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Publication number: 20040072670Abstract: A ceramic material having piezoelectric characteristics that can be sintered at low temperature and is suited to various piezoelectric devices. The ceramic material is denoted by the general formula ABOd comprised primarily of Pb, Zr, and Ti; in which A denotes (Pb1-aM1a-b) and B denotes [(M21/3Nb2/3-c)&agr;Zr&bgr;Ti&ggr;] or the formula PbxM31-x[(M41/3Nb2/3)e(Co1/3Nb2/3)f(Zn1/3Nb2/3)gZrhTii]O3. The ceramic material can be prepared by sintering at a temperature of 950° C. or below and has good piezoelectric characteristics, and in particular, good longitudinal elongation (d33) and a low dielectric loss factor (tan &dgr;) even at a high Curie temperature Tc; as well as the ceramic material has a good electromechanical coupling factor (Kp).Type: ApplicationFiled: December 2, 2003Publication date: April 15, 2004Inventors: Kazuhisa Kasukawa, Kazutoshi Ohno
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Patent number: 6692651Abstract: The invention relates to piezoelectric ceramic materials consisting of lead zirconate titanate and (1) at least one of an alkaline earth pyrochlore and an alkali metal perovskite having the formula AB5+O3, where B is Nb, Ta, or Sb; or (2) an alkaline earth alkali metal perovskite having the formula A(T1+0.25B5+0.75)O3, where A is the alkaline earth metal, T is the alkali metal, and B is Nb, Ta, or Sb. The materials are characterized by excellent heat and time stability.Type: GrantFiled: February 18, 2000Date of Patent: February 17, 2004Assignee: Leramtec AG Innovative Ceramic EngineeringInventor: Guenter Helke
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Patent number: 6685850Abstract: The invention provides a piezoelectric ceramic material comprising a Bi3TiNbO9 crystal and/or an MBi2Nb2O9 crystal which are each a bismuth layer compound, where M represents at least one element selected from Sr, Ba and Ca. The ceramic material contains Bi, Ti, M and Nb as main component elements. The molar ratio as oxides of the main component elements is given by (Bi3−xMx)z (Nb1+yTi1−y)O9 provided that 0<x, y≦0.8 and 0.95≦z≦1.05. When the molar ratio of Ba/(M+Bi) is given by xB/3 and the molar ratio of Ca/(M+Bi) is given by xC/3, it is required that 0≦xB≦0.5 and 0≦xC<0.4. This piezoelectric ceramic material, free from any lead whatsoever, has a sufficiently high Curie point, and exhibits ever more improved piezoelectric properties.Type: GrantFiled: July 27, 2001Date of Patent: February 3, 2004Assignee: TDK CorporationInventors: Masaru Nanao, Masakazu Hirose, Takeo Tsukada
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Patent number: 6656378Abstract: Disclosed is a piezoelectric ceramic composition comprising a PZT piezoelectric composition, a B-site of which is substituted with a certain material, and chromium oxide, and a piezoelectric device using the piezoelectric ceramic composition. The piezoelectric ceramic composition has good heat resistance and frequency stability, and reduces a leakage current. There is provided the piezoelectric ceramic composition comprising a main component expressed by Pb[(Co1/2W1/2)xTi1−x−yZry]O3 (wherein, 0.001≦x≦0.04, and 0.35 ≦y≦0.55), Cr2O3 in an amount of 0.01 to 2 wt %, MnO2 in an amount of 0.1 to 0.5 wt %, and an additive in an amount of 0.01 to 2.0 wt %, based on the total weight of the piezoelectric ceramic composition, in which the additive is selected from the group consisting of CoO, MgO, ZnO, Al2O3, Fe2O3, Sb2O3, SnO2, CeO2, Nb2O5, V2O5 and WO3, and mixtures thereof.Type: GrantFiled: February 8, 2002Date of Patent: December 2, 2003Assignee: S-Cera Co., Ltd.Inventors: Sang Koo Kwon, Kang Heon Hur, Jong Kuk Hong, Dong Hwan Seo
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Publication number: 20030205690Abstract: The invention comprises ferroelectric vapor deposition targets and to methods of making ferroelectric vapor deposition targets. In one implementation, a ferroelectric physical vapor deposition target has a predominate grain size of less than or equal to 1.0 micron, and has a density of at least 95% of maximum theoretical density. In one implementation, a method of making a ferroelectric physical vapor deposition target includes positioning a prereacted ferroelectric powder within a hot press cavity. The prereacted ferroelectric powder predominately includes individual prereacted ferroelectric particles having a maximum straight linear dimension of less than or equal to about 100 nanometers. The prereacted ferroelectric powder is hot pressed within the cavity into a physical vapor deposition target of desired shape having a density of at least about 95% of maximum theoretical density and a predominate maximum grain size which is less than or equal to 1.0 micron.Type: ApplicationFiled: April 23, 2003Publication date: November 6, 2003Inventors: Jianxing Li, Tim Scott, Tamara White
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Patent number: 6627104Abstract: Mechanochemical fabrication produces electroceramics using oxides as starting materials. The fabrication starts with mixing industrial ceramic oxide powders. Electroceramic phases are formed by reacting the oxide powders in a mechanochemical chamber, which is a wear-resistant cylindrical vial with one or more solid balls inside. The formation of electroceramic phases of pervoskite structure and fine crystallinity are activated by mechanical energy or a combination of mechanical energy and thermal energy. Sintered electroceramic materials and components are fabricated when compacts or green bodies made of the resulting ceramic powders are densified at the sintering temperature.Type: GrantFiled: March 26, 2001Date of Patent: September 30, 2003Assignee: The National University of SingaporeInventors: John Wang, Dongmei Wan, Junmin Xue
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Patent number: 6627105Abstract: There is disclosed a method of fabricating a piezoelectric ceramics. It can obtain a small grain size and a fine grain phase by forming a combined powder being major components, stirring the combined powder with (COOH)2 water solution, dropping a Pb(NO3)2 water solution into the stirred powder, and forming a PZT powder by calcinations and sintering processes.Type: GrantFiled: November 27, 2000Date of Patent: September 30, 2003Assignee: Shin & KimInventors: Tae Kyu Kim, Jum Soo Kim, Mun Hwa Lee, Jong Woo Kim
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Patent number: 6623656Abstract: Chemical vapor deposition (CVD) precursor compositions for forming Zr/Hf doped gate dielectric, ferroelectric, or high dielectric constant (k) metal oxide thin films. The precursor composition in one embodiment comprises a metal precursor having a general formula M(&bgr;-diketonate)2(OR)2, wherein M is Zr or Hf, and R is t-butyl. The precursor composition may also comprise a solvent medium selected from the group consisting of ethers, glymes, tetraglymes, amines, polyamines, alcohols, glycols, aliphatic hydrocarbon solvents, aromatic hydrocarbon solvents, cyclic ethers, and compatible combinations of two or more of the foregoing.Type: GrantFiled: February 26, 2001Date of Patent: September 23, 2003Assignee: Advanced Technology Materials, Inc.Inventors: Thomas H. Baum, Chongying Xu, Witold Paw, Bryan C. Hendrix, Jeffrey F. Roeder, Ziyun Wang
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Publication number: 20030168624Abstract: A piezoelectric ceramic material having the molar composition Pb(1+c)−x−(3/2a)−1/2(x·b)A1xA2a (Zry(1−x−b−x·z)Ti(1−y)(1−x·b−x·w))(B1bB2zB3w)xO3 is describedType: ApplicationFiled: January 9, 2003Publication date: September 11, 2003Inventors: Marianne Hammer, Marc Kuehlein, Horst Boeder
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Publication number: 20030136939Abstract: The disclosed invention relates to piezoelectric rare earth doped Pb(Zr,Ti)O3—Pb(Mn,Sb)O3 compounds including (zPb(ZrwTi(1−w))O3−(1−z)Pb(Mn1/3Sb2/3)O3+REx) where z is ≦0.95, 0.40<w<0.60, and where RE is a rare earth cation dopant, and 0<x<5.0%. The doped compounds have both improved Qm and (k). The RE dopants employed advantageously generate both “hardening” and “softening” effects in doped Pb(Zr,Ti)O3—Pb(Mn,Sb)O3 compounds. The RE doped Pb(Zr,Ti)O3—Pb(Mn,Sb)O3 compounds have advantageously high vibrational velocity compared to pure Pb(Zr,Ti)O3—Pb(Mn,Sb)O3 compounds and commercialized hard PZT. The disclosed invention also relates to piezoelectric devices which include the doped piezoelectric ceramic compounds.Type: ApplicationFiled: April 16, 2002Publication date: July 24, 2003Applicant: The Penn State Research FoundationInventors: Kenji Uchino, Yongkang Gao
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Publication number: 20030132418Abstract: Disclosed is a piezoelectric ceramic composition comprising a PZT piezoelectric composition, a B-site of which is substituted with a certain material, and chromium oxide, and a piezoelectric device using the piezoelectric ceramic composition. The piezoelectric ceramic composition has good heat resistance and frequency stability, and reduces a leakage current. There is provided the piezoelectric ceramic composition comprising a main component expressed by Pb[(Co1/2W1/2)xTi1-x-yZry]O3 (wherein, 0.001≦x≦0.04, and 0.35≦y≦0.55), Cr2O3 in an amount of 0.01 to 2 wt %, MnO2 in an amount of 0.1 to 0.5 wt %, and an additive in an amount of 0.01 to 2.0 wt %, based on the total weight of the piezoelectric ceramic composition, in which the additive is selected from the group consisting of CoO, MgO, ZnO, Al2O3, Fe2O3, Sb2O3, SnO2, CeO2, Nb2O5, V2O5 and WO3, and mixtures thereof.Type: ApplicationFiled: February 8, 2002Publication date: July 17, 2003Applicant: Samsung Electro-Mechanics Co., Ltd.Inventors: Sang Koo Kwon, Kang Heon Hur, Jong Kuk Hong, Dong Hwan Seo
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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: 20030096696Abstract: The present invention relates to a method for producing a lead zirconate titanate-based ceramic powder containing uniform, fine lead zirconate titanate, using a solid-phase method. The method includes the steps of mixing a lead oxide powder, a zirconium oxide powder, and a titanium oxide powder to form a mixed base powder; and heat-treating the mixed base powder so that lead oxide in the lead oxide powder and titanium oxide in the titanium oxide powder react to produce lead titanate, and that unreacted lead oxide not used in the reaction, the lead titanate produced by the reaction, and zirconium oxide in the zirconium oxide powder react to produce the lead zirconate titanate-based ceramic powder containing lead zirconate titanate.Type: ApplicationFiled: October 4, 2002Publication date: May 22, 2003Inventors: Kenichi Nada, Kazunari Okada, Masataka Kida
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Publication number: 20030085375Abstract: The subject invention includes a composite material comprising a ferroelectric material and a ferromagnetic material having a loss factor (tan &dgr;) for the composite material which includes a dielectric loss factor of the ferroelectric material and a magnetic loss factor of the ferromagnetic material. The composite material achieves the loss factor of from 0 to about 1.0 for a predetermined frequency range greater than 1 MHz. The ferroelectric material has a dielectric loss factor of from 0 to about 0.5 and the ferromagnetic material has a magnetic loss factor of from 0 to about 0.5 for the predetermined frequency range. The ferroelectric material is present in an amount from 10 to 90 parts by volume based on 100 parts by volume of the composite material and the ferromagnetic material is present in an amount from 10 to 90 parts by volume based upon 100 parts by volume of the composite material such that the amount of the ferroelectric material and the ferromagnetic material equals 100 parts by volume.Type: ApplicationFiled: November 1, 2001Publication date: May 8, 2003Applicant: Delphi Technologies Inc.Inventors: Norman W. Schubring, Joseph V. Mantese, Adolph L. Micheli
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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: 6544433Abstract: A piezoelectric ceramic composition with superior dielectric constant, mechanical quality factor Qm and electromechanical coupling factor Kp, and a high power output piezoelectric transformer made from the composition are disclosed. The piezoelectric ceramic composition is composed of Pb [(Sb1/2Nb1/2)x (Zr0.495Ti0.505)1−x] O3+yPbO+zMnO, where x is 0.01-0.05, y is 0.3-0.6 wt %, and z is 0.7 wt % or less.Type: GrantFiled: March 26, 2002Date of Patent: April 8, 2003Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Jong Sun Kim, Choong Sik Yoo, Joo Hyun Yoo, Yong Woo Lee
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Patent number: 6533957Abstract: A piezoelectric ceramic composition with superior mechanical quality factor Qm and electromechanical coupling factor Kp, and a high power output piezoelectric transformer made from the composition are disclosed. The piezoelectric ceramic composition according to the present invention is composed of Pb1−aSra[(Ni1/2W1/2)b(Mn1/3Nbz/3)c(Zr1−xTix)1−b−c]O3+kPbO, where a is 0-0.06, b is 0.01-0.05, c is 0.01-0.09, x is 0.47-0.53, and k is 0.1-0.7 wt %.Type: GrantFiled: March 26, 2002Date of Patent: March 18, 2003Assignee: Samsung Electro-Mechanics Co., Ltd.Inventors: Jong Sun Kim, Choong Sik Yoo, Joo Hyun Yoo, Yong Woo Lee
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Patent number: 6514426Abstract: A piezoelectric ceramic composition and a piezoelectric element in which cracks and chips are not likely to occur during working even if the thicknesses are reduced, are provided. The piezoelectric ceramic composition contains as a primary component, a complex oxide having a perovskite structure, composed of at least Pb, Zr, Ti, Mn, Nb and O, and represented by general formula ABO3, in which the total molar quantity of elements constituting A is smaller than the total molar quantity of elements constituting B, and Si is present as a secondary component at the content of about 0.010 wt % to 0.090 wt %, in terms of SiO2, relative to the primary component.Type: GrantFiled: August 20, 2001Date of Patent: February 4, 2003Assignee: Murata Manufacturing Co. Ltd.Inventors: Ryosuke Tanimoto, Yoichi Tsuji, Masanori Kimura, Hitoshi Takagi
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Publication number: 20030000422Abstract: The object of the present invention is to provide a solution and a method for forming a ferroelectric film capable of forming a uniform film free from uneven coating (striation).Type: ApplicationFiled: December 20, 2000Publication date: January 2, 2003Applicant: NEC Corporation and Kanto Kagaku Kabushiki KaishaInventors: Takashi Hase, Yoichi Miyasaka, Toshinobu Shinnai, Hiroshi Morioka, Taku Yamate, Hayato Katsuragi, Kiyoto Mori
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Publication number: 20020190237Abstract: The Invention relates to piezoelectric ceramic materials with a base consisting of lead zirconate titanate. Said materials are characterised by the excellent heat- and time-stability of the functional characteristics.Type: ApplicationFiled: February 18, 2000Publication date: December 19, 2002Inventor: GUENTER HELKE
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Publication number: 20020163706Abstract: An electro-optically deactivated transmissive material comprises a plurality of chemicals which are sufficient, in combination, to enable formation of an electro-optic material having an index of refraction that is responsive to an electric field. The chemicals are combined with a glassifier so as to form a transmissive material that is less responsive to the electric field than said electro-optic material. The deactivated material has substantially the same refractive index as the electro-optic material in the absence of an electric field. In a preferred embodiment, the deactivated material is arranged with active material to form an optical switch.Type: ApplicationFiled: June 26, 2001Publication date: November 7, 2002Inventor: Gene H. Haertling
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Publication number: 20020149299Abstract: A piezoelectric ceramic composition in which the mechanical quality factor Qm and the electromechanical coupling factor Kp are superior, and a high power output piezoelectric transformer made of it are disclosed.Type: ApplicationFiled: March 26, 2002Publication date: October 17, 2002Applicant: Samsung Electro-Mechanics Co., LtdInventors: Jong Sun Kim, Choong Sik Yoo, Joo Hyun Yoo, Yong Woo Lee
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Publication number: 20020139955Abstract: A method of synthesizing a PGO spin-coating precursor solution includes utilizing the starting materials of lead acetate trihydrate (Pb(OAc)2.3H2O) and germanium alkoxide (Ge(OR)4(R=C2H5 and CH(CH3)2)). The organic solvent is di(ethylene glycol) ethyl ether. The mixed solution of lead and di(ethylene glycol) ethyl ether is heated in an atmosphere of air at a temperature no greater than 185° C., and preferably no greater than 190° C. for a time period in a range of thirty minutes to four hours. During the heating step the color of the solution is monitored to determine when the reaction is complete and when decomposition of the desired product begins to take place. The solution is then added to germanium di(ethylene glycol) ethyl ether to make the PGO spin-coating solution. This second step also entails heating the solution to a temperature no greater than 190° C. for a time period in a range of 0.5 to 2.0 hours.Type: ApplicationFiled: March 30, 2001Publication date: October 3, 2002Inventors: Wei-Wei Zhuang, Fengyan Zhang, Jer-Shen Maa, Sheng Teng Hsu
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Patent number: 6454959Abstract: A piezoelectric ceramic material is provided which can form a sintered piezoelectric ceramic compact having a low electromechanical coupling coefficient, a low resonant resistance and a low temperature dependence of the resonant frequency. The piezoelectric ceramic material is a solid solution having a primary component composed of PbTiO3, PbZrO3 and Pb(MaXMdY)O3, in which Ma is at least one bivalent element or trivalent element, and Md is at least one pentavalent element or hexavalent element, and the ratio X/Y of the Ma content X to the Md content Y is larger than the stoichiometric ratio. Preferred is Ma being Mn, Md being at least one of Nb, Sb, Ta and W, and when the contents of Mn, Nb, Sb, Ta and W are represented by A, B, C, D and E, respectively, 0.525≦A/(B+C+D+2E)≦1, and about 20 mole percent or less of the element Pb being replaced by at least one of Ca, Ba, Sr and La.Type: GrantFiled: August 16, 2001Date of Patent: September 24, 2002Assignee: Murata Manufacturing Co. Ltd.Inventors: Isamu Yoshizawa, Katsuhiro Horikawa
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Publication number: 20020117647Abstract: A modified PbZrTiO3 perovskite crystal material thin film, wherein the PbZrTiO3 perovskite crystal material includes crystal lattice A-sites and B-sites at least one of which is modified by the presence of a substituent selected from the group consisting of (i) A-site substituents consisting of Sr, Ca, Ba and Mg, and (ii) B-site substituents selected from the group consisting of Nb and Ta. The perovskite crystal thin film material may be formed by liquid delivery MOCVD from metalorganic precursors of the metal components of the thin film, to form PZT and PSZT, and other piezoelectric and ferroelectric thin film materials. The thin films of the invention have utility in non-volatile ferroelectric memory devices (NV-FeRAMs), and in microelectromechanical systems (MEMS) as sensor and/or actuator elements, e.g., high speed digital system actuators requiring low input power levels.Type: ApplicationFiled: August 27, 2001Publication date: August 29, 2002Inventors: Jeffrey F. Roeder, Ing-Shin Chen, Steven Bilodeau, Thomas H. Baum
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Patent number: 6440324Abstract: A piezoelectric ceramic composition capable of obtaining a piezoelectric member that can provide a sufficient sintering density even by firing at a low temperature besides only allowing small amount of Pb to be evaporated by firing to reduce deterioration of electrical characteristics, wherein the piezoelectric member comprises a perovskite structure oxide of the piezoelectric ceramic composition containing Pb, Ti, Zr, Ma (Ma represents at least one of Cr, Mn, Fe and Co) and Md (Md represents at least one of Nb, Sb, Ta and W), and wherein a represents the total content (in mole) of Ma, and b, c, d and e (in mole) represent the contents of Sb, Nb, Ta and W, respectively, and 0.50<a/(b+c+d+2e).Type: GrantFiled: August 25, 2000Date of Patent: August 27, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Koichi Hayashi, Akira Ando, Toshikatsu Hisaki, Yuji Yoshikawa, Masanori Kimura
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Patent number: 6423245Abstract: A piezoelectric ceramic composition for a surface acoustic wave device which can improve the electromechanical coupling coefficient is provided. The piezoelectric ceramic composition for a surface acoustic wave device is represented by the formula PbaZrxTiy(NimMnnNb⅔)zO3, wherein x+y+z=1, 0.93≦a≦1.02, 0.32≦x≦0.50, 0.41≦y≦0.54, 0.03≦z≦0.21 and 0.24≦m+n≦0.67.Type: GrantFiled: August 23, 2001Date of Patent: July 23, 2002Assignee: Murata Manufacturing Co. LtdInventor: Koji Ogiso
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Patent number: 6413443Abstract: The piezoelectric ceramic includes oxide represented by (Pb1−aAa)s[Zn1/3Nb2/3)w(Mn1/3B2/3)xTiyZrz]O3. A represents at least one element in the group comprising Ca, Sr and Ba. B represents at least one element in the group comprising Nb, Sb and Ta and a, s, w, x, y and z are within a range of 0≦a≦0.1, 0.9≦s<1.0, 0.2≦w/x≦3.0, 0.1≦y≦0.5 and 0.2≦z≦0.6, respectively and w+x+y+z=1. Therefore, the high mechanical strength can be attained easily and reasonably and also the excellent piezoelectric properties are attained without grinding calcined powder or a hot press.Type: GrantFiled: November 16, 2000Date of Patent: July 2, 2002Assignee: TDK CorporationInventors: Masahito Furukawa, Junichi Yamazaki, Yoshiko Gokita
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Patent number: 6409935Abstract: The invention is a novel fullerene-added lead zirconate titanate and a method of producing the same, wherein zirconium alkoxide, titanium alkoxide and lead acetate are dissolved in an organic solvent with a stabilizer to form a colloidal solution or sol. The colloidal solution is added with fullerene, gelatinized, dried and fired at a relatively low temperature, for example, 400 to 500° C., whereby a perovskite phase can effectively be formed at a temperature lower than in conventional methods.Type: GrantFiled: February 22, 2000Date of Patent: June 25, 2002Assignee: Tokyo, The University ofInventors: Kun-ichi Miyazawa, Kunio Ito, Toru Kuzumaki, Fumie Seki
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Publication number: 20020071969Abstract: When a piezoelectric material is manufactured by hydrothermal method, the proper amount of lead contained in the piezoelectric film can be ensured and decreases in piezoelectric characteristics can be prevented. A method for manufacturing a piezoelectric material expressed by the formula ABO3, containing an element “a” as the element expressed by A above, and having a perovskite crystal structure, comprises a first step of producing an oxide containing an element “a′”, and a second step of producing a piezoelectric material by subjecting the oxide produced in the first step to a hydrothermal processing using an aqueous solution containing the element “a”, wherein the amount of the element “a”, contained in the piezoelectric material produced in the second step is increased over the amount of the element “a” contained in the oxide produced in the first step.Type: ApplicationFiled: January 18, 2002Publication date: June 13, 2002Inventors: Hong Qiu, Koji Sumi, Tsutomu Nishiwaki, Masanori Okuyama, Zhiqiang Wei
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Patent number: 6402981Abstract: There is provided a composition of piezoelectric porcelain which is composed as x(Pb2Sb2O7)½. (1−x)[Pba(ZryTiz)O3] (provided that 0.98≦a≦0.999, 0.005≦x≦0.05, 0.50≦y≦0.54, 0.46≦z≦0.50, y+z=1) is a main component, and to the weight of 1 mol of the main component, 0.1 to 1.0 wt % of at least one kind of W, Sb, Nb, and Ta in terms of WO3, Sb2O3, Nb2O5, and Ta2O5 is added as a sub component, and 0.01 to 0.1 wt % of Si in terms of SiO2 is added as a further sub component.Type: GrantFiled: September 19, 2000Date of Patent: June 11, 2002Assignee: TDK CorporationInventor: Satoshi Sasaki
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Publication number: 20020056827Abstract: A piezoelectric element includes a ceramic substrate, a piezoelectric(s) made of a ceramic composition composed mainly of a PbMg⅓Nb⅔O3—PbZrO3—PbTiO3 ternary system solid solution composition represented by the following general formula (1) and containing 0.05 to 10.0% by weight, based on the ceramic composition, of NiO, and electrodes electrically connected to the piezoelectric.Type: ApplicationFiled: September 17, 2001Publication date: May 16, 2002Applicant: NGK Insulators, LtdInventor: Toshikatsu Kashiwaya
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Publication number: 20020053859Abstract: Provided are a piezoelectric element by which a pressure of a better displacement is obtained, a process for producing the same and an ink jet recording head having the piezoelectric element.Type: ApplicationFiled: December 22, 2000Publication date: May 9, 2002Applicant: KANSAI RESEARCH INSTITUTEInventor: Toshimi Fukui
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Patent number: 6383408Abstract: A piezoelectric ceramic is provided which has a very low loss and superior workability in micro-fabrication. The piezoelectric ceramic contains at least Pb, Mn, Nb, Ti and Zr as primary metal components, in which, when the composition of the piezoelectric ceramic is represented by the formula Pbx{(MnaNbb)yTizZr(1−Y−z)}O3, the x, y, z, a, and b are, on a molar basis, such that 0.95≦x≦0.995, 0.055≦y≦0.10, 0.40≦z≦0.55, 2.01≦b/a≦2.40, and a+b=1. In addition, the average grain diameter of the sintered piezoelectric ceramic is about 2 &mgr;m or less.Type: GrantFiled: September 29, 2000Date of Patent: May 7, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Katsuhiro Horikawa, Koji Matsubara
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Publication number: 20020043642Abstract: A piezoelectric ceramic composition and a piezoelectric element in which cracks and chips are not likely to occur during working even if the thicknesses are reduced, are provided. The piezoelectric ceramic composition contains as a primary component, a complex oxide having a perovskite structure, composed of at least Pb, Zr, Ti, Mn, Nb and O, and represented by general formula ABO3, in which the total molar quantity of elements constituting A is smaller than the total molar quantity of elements constituting B, and Si is present as a secondary component at the content of about 0.010 wt % to 0.090 wt %, in terms of SiO2, relative to the primary component.Type: ApplicationFiled: August 20, 2001Publication date: April 18, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Ryosuke Tanimoto, Yoichi Tsuji, Masanori Kimura, Hitoshi Takagi
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Publication number: 20020036282Abstract: A perovskite compound of the formula, (Na½Bi½)1−xMx(Ti1−yM′y)O3±z, where M is one or more of Ca, Sr, Ba, Pb, Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; and M′ is one or more of Zr, Hf, Sn, Ge, Mg, Zn, Al, Sc, Ga, Nb, Mo, Sb, Ta, W, Cr, Mn, Fe, Co and Ni, and 0.01<x<0.3, and 0.01<y<0.3, and z<0.1 functions as an electromechanically active material. The material may possess electrostrictive or piezoelectric characteristics.Type: ApplicationFiled: April 6, 2001Publication date: March 28, 2002Inventors: Yet-Ming Chiang, Sossity A. Sheets, Gregory W. Farrey, Nesbitt W. Hagood, Andrey Soukhojak, Haifeng Wang
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Publication number: 20020027215Abstract: A piezoelectric material exhibiting a high Curie point and a high displacement at a low drive voltage is provided. The piezoelectric material contains as a main component a composite oxide and is expressed by the general formula [Pb{1−x1−x2−&agr;(x1−x2)}, A1x1, A2x2]{(Tiy, Zrz) (1−&bgr;(x1−x2)−&ggr;), (Y0.5, Nb0.5)&ggr;}O3, where y +z=1, 1.15 <z/y<1.30 and 0<&ggr;<0.1; and A1, A2, x1, x2 satisfy any of the conditions (i) A1 is at least selected one of Ce and La, A2 is K, 0.02≦x1<0.08, 0≦x2≦0.05 (0.02≦x1+x2≦0.1, x1≦x2) and &agr;=0, &bgr;=0.25 or &agr;=0.5, &bgr;=0, and (ii) A1 is Sr, A2 is Ba, 0.03 ≦x1≦0.05, 0.03≦x2≦0.05 (|x1−x2|≦0.01), and &agr;=0, &bgr;=0.Type: ApplicationFiled: May 10, 2001Publication date: March 7, 2002Inventors: Hitoshi Shindo, Atsuhiro Sumiya, Eturo Yasuda, Takashi Yamamoto
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Publication number: 20010054704Abstract: A piezoelectric ceramic composition in which the dielectric constant, the mechanical quality factor Qm and the electromechanical coupling factor Kp are superior, and a high power output piezoelectric transformer made of it are disclosed.Type: ApplicationFiled: December 5, 2000Publication date: December 27, 2001Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Jong Sun Kim, Choong Sik Yoo, Joo Hyun Yoo, Yong Woo Lee
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Patent number: 6322718Abstract: Low loss piezoelectric ceramic compositions cofirable with silver at a reduced sintering temperature and methods for producing the such compositions are provided. The compositions are binary piezoelectric ceramic compositions having a first component which is characterized by about 95.0 to about 99.5 weight percent of a system represented by a general formula Pb(ZrxTi1−x)O3+y wt % MnO2 in which x and y represent weight percentages and wherein x is within a range from 0.0 to about 1.0, and y is within a range from about 0.1 to about 1.0. The compositions also have 0.5 to 5.0 wt % of a second component represented by the general formula w wt % Bi2O3−z wt % CdO in which w and z represent weight percentages and wherein w is within a range from about 0.1 to about 1.0, and z is within a range from about 0.1 to about 2.0. The piezoelectric ceramic compositions are non-reactive with a silver electrode layer when cofired therewith at sintering temperatures of about 900° C.Type: GrantFiled: September 21, 1999Date of Patent: November 27, 2001Assignee: CTS CorporationInventors: Xunhu Dai, Donald W. Forst
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Patent number: 6299791Abstract: A piezoelectric ceramic material able to form a piezoelectric ceramic sintered body having such characteristics as a small electromechanical coupling coefficient, small resonant resistance and small temperature dependency of the resonant frequency that is required for designing a narrow-band filter is represented by principal component of the general formula of (PbaSrb)(ZrcTidMneNbf)O3 and having a composition satisfying the following relations of 0.93≦a≦1.01, 0.01≦b≦0.04, 0.37≦c≦0.47, 0.48≦d≦0.58, 0.0105≦e≦0.06, 0.02≦f≦0.06 and 1.05≦2e/f≦2, and comprising sub-components of about 0.003% to 0.1% by weight of each of SiO2 and Al2O3 relative to the principal component.Type: GrantFiled: May 22, 2000Date of Patent: October 9, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Isamu Yoshizawa, Katsuhiro Horikawa
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Publication number: 20010020694Abstract: The present invention provides 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.Type: ApplicationFiled: February 27, 2001Publication date: September 13, 2001Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Hiroaki Makino, Mitsuru Asai, Nobuo Kamiya, Shin Tajima, Katsunori Yamada, Hiroshi Hohjo
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Patent number: 6280650Abstract: A piezoelectric buzzer formed by using a piezoelectric ceramic having both a higher heat resistance and a higher piezoelectric characteristics than those of a conventional product. The piezoelectric buzzer 10 of the present invention has a metal plate 12. Formed on the metal plate 12 is a piezoelectric ceramic 14. Further, formed on the piezoelectric ceramic 14 is an electrode 16. The piezoelectric composition forming the piezoelectric ceramic is a piezoelectric ceramic composition characterized in that about 0.2 to 2 mol % of the Pb atoms of a lead zirconate titanate (PZT) represented by the composition formula PbA[(TixZr1-x)a(SnyCr1-y)bSbc]O3 has been displaced by La, wherein 0.94≦A≦1.02, 0.46≦x≦0.51, 0.01≦y≦0.5, 0.01≦b≦0.03, 0.01≦c≦0.04,a+b+c=1.Type: GrantFiled: April 6, 2000Date of Patent: August 28, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Tomoyuki Ogawa, Katsuhiro Horikawa
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Patent number: 6221271Abstract: A piezoelectric sintered ceramic made of (a) 100 parts by weight of main components having a composition represented by the general formula: (Pb1−yMy)(ZrzTi1−z)O3, wherein M is at least one element selected from the group consisting of Sr, Ba and Ca, and y and z are numbers satisfying 0.01≦y≦0.10, and 0.51≦z≦0.56, respectively; (b) 0.05-1.0 parts by weight, as Fe2O3, of Fe; and (c) 10-1000 ppm of Ag.Type: GrantFiled: March 22, 1999Date of Patent: April 24, 2001Assignee: Hitachi Metals, Ltd.Inventors: Junichi Watanabe, Hiromi Kikuchi, Hideko Fukushima, Shigeru Jomura
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Patent number: 6207069Abstract: Manganese oxide and tantalum oxide are added to a piezoelectric ceramic composition based on lead zinc-niobate titanate zirconate. The composition is suitable for piezo-electric transformers since its mechanical quality factor (Qm) is improved without reducing its electromechanical coupling coefficient (k31), and good high-power properties and high mechanical strength are obtained. In another embodiment, manganese oxide and at least one of antimony oxide and niobium oxide are added to a piezoelectric ceramic composition based on lead zinc-niobate titanate zirconate.Type: GrantFiled: February 22, 1999Date of Patent: March 27, 2001Assignee: TDK CorporationInventors: Masahito Furukawa, Kazutaka Suzuki, Yoshiko Gokita, Takumi Satou, Keisuke Itakura
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Patent number: 6207070Abstract: Composition for piezoelectric ceramics includes a main component and a sub component. The main component is expressed with a general expression of aPb(Mg⅓Nb⅔)O3-bPb(Yb⅓Nb⅔)O3-cPbTiO3-dPbZrO3, where a+b+c+d=1, 0.01≦a≦0.07, 0.01≦b≦0.07, 0.35≦c≦0.55, and 0.4≦d≦0.6. The sub component contains 0.1 to 0.7 wt % of Mn in terms of manganese oxide, 0.01 to 0.3 wt % of Cr in terms of chromium oxide and 0.05 to 0.5 wt % of Co in terms of cobalt oxide per the weight of 1 mol of main component.Type: GrantFiled: August 12, 1999Date of Patent: March 27, 2001Assignee: TDK CorporationInventors: Satoshi Sasaki, Masaru Abe