Abstract: A dielectric ceramic composition having high static capacitance and high dielectric constant and satisfying X7R characteristics and a multilayer ceramic capacitor using the same is provided. The dielectric ceramic composition comprises barium titanate as a main component, and comprises magnesium oxide, dysprosium oxide, barium oxide, calcium oxide, and vanadium oxide, as subcomponents, wherein magnesium oxide converted into MgO is 1 to 3 mol, dysprosium oxide converted into Dy2O3 is 1 to 5 mol, total of barium oxide and calcium oxide converted into BaO and CaO, respectively, is 0.1 to 5 mol, and vanadium oxide converted into V2O5 is 0.01 to 0.1 mol, when barium titanate converted into BaTiO3 is 100 mol.

Abstract: The present invention provides an electro-optic ceramic material including lead, zinc and niobium having a propagation loss of less than about 3 dB/cm and a quadratic electro-optic coefficient of greater than about 1×10−6 m2/V2 at 20° C. at a wavelength of 1550 nm. The present invention also provides electro-optic devices including an electro-optic ceramic material including lead, zinc and niobium having a propagation loss of less than about 3 dB/cm and a quadratic electro-optic coefficient of greater than about 1×10−16 m2 V at 20° C. at a wavelength of 1550 nm. The materials and devices of the present invention are useful in optical communications applications such as intensity and phase modulation, switching, and polarization control.

Abstract: A low temperature sinterable dielectric ceramic composition and a multilayer ceramic chip capacitor. The dielectric ceramic composition is expressed by the general formula: aBaTiO3-bMgCO3-cY2O3-dCr2O3-eV2O5-f(xZrO2-y(K,Li)2O-zSiO2) (x+y+z=1; 0.05≦x≦0.18, 0.01≦y≦0.08, and 0.7.4≦z≦0.93); in which a, b, c, d, e and f are molar ratios; a=100, 1.0≦b≦2.0, 0.2≦c≦2.0, 0.02≦d≦0.3, 0.02≦e≦0.3, and 0.5≦f<2. The multilayer ceramic chip capacitor is prepared using the dielectric ceramic composition. The dielectric composition according to the present invention can be sintered at a low temperature without decrease of a dielectric constant, making it possible to make ultra thin-layered dielectrics.

Abstract: A dielectric ceramic composition of high dielectric constant and low dielectric loss, which can be co-fired with Ag electrodes, is provided for use in various parts of electric and electronic appliances. The composition is represented by the following chemical formula: a wt. % {x BaO—y1Nd2O3—y2Sm2O3—w Bi2O3—z TiO2}+ b wt. % (ZnO—B2O3—SiO2—PbO based glass frit)+ c wt. % CuO wherein, 10.0 mol %≦x≦20.0 mol %; 7.0 mol %≦y1+y2≦20.0 mol %; 0.5 mol %≦w≦5.0 mol %; 60.0 mol %≦z≦80.0 mol %, with the proviso that x+y1+y2+w+z=100; 80.0 wt. %≦a≦98.0 wt. %; 1.0 wt. %≦b≦10.0 wt. %; 1.0 wt. %≦c≦10.0 wt. %.

Abstract: The present invention discloses low-cost ceramic powders prepared by the conventional ceramic processing with ceramic raw materials comprising carbonates, oxides and/or hydroxides of barium (Ba), titanium (Ti), magnesium (Mg) and optionally strontium (Sr), lanthanum (La) and niobium (Nb), and lead titanate (PbTiO3) and/or lead oxide (PbO). The present invention also discloses a ceramic material obtained by the ceramic powder through densification and reduction-reoxidation, which has a dielectric constant of about 20,000 to about 55,000, a dielectric loss tangent (tan &dgr;) of about 0.05 to about 0.25, a low capacitance change with temperature (low TCC) of about −15% to about 10% at a temperature range of −55° C. to 150° C., a resistivity of about 106 &OHgr;·cm to about 109 &OHgr;·cm, and a small grain size of about 0.5 to about 3.5 &mgr;m.

Abstract: An integrated ceramic module is formed of a first ceramic dielectric layer containing a glass as a sintering agent and having a high dielectric constant and high Q value, formed with an electronic component, and a second ceramic dielectric layer containing a glass as a sintering agent and having a low dielectric constant and a high Q value, formed with a signal transmission line.

Abstract: 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.

Abstract: The invention includes a dielectric ceramic powder mixture comprising 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 flux; from 0.1 to 0.3 weight percent of MnCO3; a grain growth inhibitor such as niobium oxide or other niobate compound; and, 0.4 to 1.2 weight percent of an additive selected from the group consisting of a rare earth oxide, yttrium oxide, a combination of rare earth oxides, and a combination of yttrium oxide and rare earth oxides, such that ions of the additive(s) have an average ionic radius of about 0.97 angstroms. The dielectric ceramic powder provides a start powder for making very low firing multilayer ceramic capacitors satisfying X7R performance requirements.

Abstract: A multilayer ceramic capacitor includes sintered laminated bodies having a plurality of dielectric layers alternately stacked with a multiplicity of internal electrodes, and a pair of external electrodes electrically coupled to the internal electrodes. The dielectric layer is of sintered ceramic grains. The ceramic grains include a core portion surrounded by a shell portion or a solid solution. The ceramic grains contain additive elements such as acceptor elements and/or rare earth elements. The additive elements are non-uniformly distributed in the core and/or shell portion of the ceramic grain or in the solid solution. Such non-uniform distribution of the additive elements in ceramic grains promotes or facilitates the re-oxidation process of the ceramic grains and also increases electrical resistance thereof. Accordingly, the operating life characteristics of the multilayer ceramic capacitors, especially those incorporating therein thin dielectric layers, can be improved.

Abstract: The invention describes an electronic component, in particular a multiplayer component, with a dielectric and at least one electrode. The dielectric is a composite made of a dielectric ceramic material and an organic polymer. To manufacture the electronic component, the dielectric ceramic material is mixed with a suitable monomer, the mass id formed, and the monomer is polymerized. Ceramic bodies of stable shape are obtained which can be processed further into capacitors, antennas, or other passive components in that electrodes are provided. Sintering of the electronic components is no longer necessary.

Abstract: Dielectric composite materials including an electronically tunable dielectric phase and a calcium and oxygen-containing compound are disclosed. The tunable phase may comprise a material such as barium strontium titanate. The calcium/oxygen compound may comprise CaO or a transition metal-containing compound such as Ca2Nb2O7 or CaTiO3. The material may also include a rare earth oxide dopant such as CeO2. The materials resist dielectric breakdown and possess improved combinations of electronic properties. The materials may be tailored for specific applications.

Abstract: In a dielectric ceramic composition comprising: 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; and 0.03 to 0.6 mol % of oxides of one or more elements selected from the group consisting of Mn, V and Cr, the content of the oxide of the Ba, Ti and Zr is calculated by assuming that the oxide thereof is Ba(Ti1−xZrx)O3; the contents of the oxides of the Re and Mg being calculated by assuming that the oxides thereof are Re2O3 and MgO, respectively; the contents of the oxides of the Mn, V and Cr being calculated by assuming that the oxides thereof are Mn2O3, V2O5 and Cr2O3, respectively. A ratio of Ba/(Ti1−xZrx) ranges from about 1.000 to about 1.010 and x in Ti1−xZrx ranges from about 0.05 to about 0.26.

Abstract: The dielectric ceramic composition of the first aspect of the invention comprises an essential component having a compositional formula of xBaO-yTiO2-zNd2O3 (wherein 0.02≦x≦0.2, 0.6≦y≦0.8, 0.01≦z≦0.3, x+y+z=1), and contains two types of glass powder, one comprising PbO, ZnO and B2O3 and the other comprising SiO2 and B2O3, and a third component that comprises Al2O3, SrTiO3, GeO2 and Li2O. Its advantages are that it can be sintered at low temperatures, its dielectric constant &egr;r falls between 10 and 50 or so, its unloaded Q is large, and its temperature-dependent resonant frequency change is small. The dielectric ceramic composition of the second aspect of the invention comprises an essential component having a compositional formula of s(xBaO-yTiO2-zNd2O3)-tNd2Ti2O7 (wherein 0.02≦x≦0.2, 0.6≦y≦0.8, 0.01≦z≦0.3, x+y+z=1, 0.1≦s≦0.8, 0.2≦t≦0.

Abstract: A dielectric ceramic composition including a dielectric base phase containing BaTiO3 as a main component, and plate-shaped or acicula deposition phase existing together in the dielectric base phase. Preferably, the dielectric ceramic composition includes a main component of BaTiO3, a first subcomponent including at least one compound selected from MgO, CaG, BaG, 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.

Abstract: A dielectric ceramic composition, comprising a main component including barium titanate, a fourth subcomponent including an oxide of R1 (note that R1 is at least one kind selected from a first element group composed of rare-earth elements having a effective ionic radius of less than 108 pm when having a coordination number of nine), and a fifth subcomponent including an oxide of R2 (note that R2 is at least one kind selected from a second element group composed of rare-earth elements having a effective ionic radius of 108 pm to 113 pm when having a coordination number of nine). According to the composition, a dielectric ceramic composition having excellent reducing resisting property at firing, excellent temperature dependence of capacitance after firing, and improved accelerated lifetime of insulation resistance can be provided.

Abstract: A dielectric ceramic containing Bi, Zn, and Sr as constituent elements. A resin-ceramic composite material containing a mixture of the dielectric ceramic powder and an organic polymer resin. An antenna and an electrical part using the composite material, and a manufacturing method thereof.

Abstract: 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.

Abstract: The invention relates to a glass ceramic mass containing at least one oxide ceramic containing barium, titanium and at least one rare earth metal Rek; and at least one glass material containing at least one oxide with boron, at least one oxide with silicon and at least one oxide with at least one bivalent metal Me2+. The glass ceramic mass is characterised in that the glass material contains at least one oxide with bismuth, especially bismuth trioxide. The oxide ceramic is especially a microwave ceramic of formula BaRek2Ti4O12, Rek being neodymium or samarium. The composition of the oxide ceramic remains essentially constant during the sintering of the glass ceramic, enabling the material properties of the glass ceramic mass, such as permittivity (20-80), quality (800-5000) and Tkf (±20 ppm/K) to be specifically predetermined. The glass ceramic mass is characterised by a densification temperature of under 910 ° C.

Abstract: The invention relates to a glass ceramic mass, comprising at least one oxide ceramic, containing barium, titanium and at least one rare earth metal Rek and at least one glass material, containing at least one oxide with boron and at least one oxide of a rare earth metal Reg. The glass material further contains either an oxide of a tetravalent metal Me4+, or at least one oxide of a pentavalent metal Me5+. A compression of the glass ceramic mass occurs above all by viscous flow. A low vitrification temperature can thus be achieved. Crystallisation products are produced during and/or after the compression. The rare earth oxide and the crystallisation products can be used to pre-determine each of a dielectric material property of the glass ceramic mass in a wide range such as permittivity (15-80), Q (350-5000) and Tf value (±20 ppm/K). The glass ceramic mass is characterised by a vitrification temperature of below 850° C.

Abstract: Multilayer ceramic chip capacitors which satisfy X5R (−55 to 85° C., &Dgr;C=±15%) requirements and which are compatible with reducing atmosphere sintering conditions so that base metals such as nickel and nickel alloys may be used for internal electrodes are made in accordance with the invention.

Abstract: A dielectric thin film material for high frequency use, including use as a capacitor, and having a low dielectric loss factor is provided, the film comprising a composition of tungsten-doped barium strontium titanate of the general formula (BaxSr1−x)TiO3, where X is between about 0.5 and about 1.0. Also provided is a method for making a dielectric thin film of the general formula (BaxSr1−x)TiO3 and doped with W, where X is between about 0.5 and about 1.0, a substrate is provided, TiO2, the W dopant, Ba, and optionally Sr are deposited on the substrate, and the substrate containing TiO2, the W dopant, Ba, and optionally Sr is heated to form a low loss dielectric thin film.

Abstract: A ceramic capacitor containing at least one dielectric layer formed from a dielectric ceramic composition comprising a sintered body containing ceramic particles having a core/shell structure in an amount of 15% or more based on the total ceramic particles of the sintered body, the core/shell structured particle being composed of a core portion, which is BaTiO3 crystal, and a shell portion surrounding the core portion, which is made of a solid solution comprising BaTiO3 as a major component, has excellent temperature characteristics and a long life-time.

Abstract: The present invention provides an electro-optic ceramic material including lead, zinc and niobium having a propagation loss of less than about 3 dB/cm and a quadratic electro-optic coefficient of greater than about 1×10−6 m2/V2 at 20° C. at a wavelength of 1550 nm. The present invention also provides electro-optic devices including an electro-optic ceramic material including lead, zinc and niobium having a propagation loss of less than about 3 dB/cm and a quadratic electro-optic coefficient of greater than about 1×10−16 m2 V at 20° C. at a wavelength of 1550 nm. The materials and devices of the present invention are useful in optical communications applications such as intensity and phase modulation, switching, and polarization control.

Abstract: Disclosed is a dielectric composition, which is advantageous in light of increased homogeneity and insulation resistance, a method of preparing the same and a multi-layer ceramic capacitor using the same. The dielectric composition consists of a dielectric component represented by (Ba1−x−yCaxAy)m(Ti1−a−b−cZraB′bB″c)O3+m, (wherein, 0.01≦x≦0.10, 0.003≦y≦0.015, 0.16≦a≦0.20, 0.003≦b≦0.015, 0≦c≦0.015, 1.000≦m≦1.010; the component A is selected from among Y oxides, La oxides, Ho oxides, Dy oxides, Er oxides, Hf oxides and combinations thereof; the component B′ is selected from among Mn oxides, Co oxides, Ni oxides and combinations thereof; and the component B″ is selected from among V oxides, Nb oxides, Ta oxides and combinations thereof), and a sintering aid represented by zLi2O-2(1−z)SiO2(0≦Z≦0.9).

Abstract: 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.

Abstract: Provided is a dielectric ceramic composition suitably used for forming dielectric ceramic layers which constitute a laminated ceramic capacitor obtained by firing in a reducing atmosphere. Even when the dielectric ceramic composition is formed into thin dielectric ceramic layers, a highly reliable laminated ceramic capacitor having a small temperature coefficient of capacitance, a long lifetime under high temperature and high pressure conditions, and a small change in electrostatic capacitance with time under a DC voltage application can be realized. The dielectric ceramic composition contains a primary component, an additive component, and an auxiliary sintering agent, wherein the primary component and the additive component are represented by the formula 100BaTiO3+a{(1−b)R+bV}+cM, and 1.25≦a≦8.0, 0<b≦0.2, 1.0<c≦6.0, and a/c>1.1 are satisfied.

Abstract: 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.

Abstract: A ceramic powder including ceramic main component particles and additive component particles deposited on the surfaces of the main component particles. The mean particle size of the main component particles is made not more than 1.5 &mgr;m, and the mean particle size of the additive component particles is made not more than 0.31 &mgr;m. The content of the additive composition particles is made 0.1 to 5 wt % with respect to 100 parts by weight of the ceramic powder. The dispersibility of the additive component particles with respect to the main component particles is improved and the uniformity of the structure is promoted to suppress the occurrence of hetero phases. A multilayer ceramic electronic device having a high insulation breakdown voltage and long life even with a thickness of the dielectric layers of not more than 3 &mgr;m are provided.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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).

Abstract: A composite multilayer ceramic electronic part includes a high dielectric-constant layer and at least one low dielectric-constant layer laminated with each other, the high dielectric-constant layer including a high dielectric-constant material and has a relative dielectric constant &egr;r of about 20 or more, and the low dielectric-constant layer including a low dielectric-constant material and has a relative dielectric constant &egr;r of about 10 or less. The high dielectric-constant material mainly comprises a BaO—TiO2—ReO3/2 dielectric and a first glass composition, the BaO—TiO2—ReO3/2 dielectric being represented by xBaO-yTiO2-zReO3/2, where x, y and z are % by mole and satisfy the following conditions: 8≦x≦18; 52.5≦y≦65; 20≦z≦40; and x+y+z=100; and Re is a rare earth element, and the low dielectric-constant material comprises a composite of a ceramic and a second glass composition.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A dielectric ceramic composition comprising a main component composed of barium titanate, a first subcomponent including an oxide of AE (note that AE is at least one element selected from Mg, Ca, Ba and Sr), and a second subcomponent including an oxide of R (note that R is at least one element selected from Y, Dy, Ho and Er), wherein ratios of the subcomponents to 100 moles of the main component are, the first subcomponent: 0 mole<the first subcomponent<0.1 mole, and the second subcomponent: 1 mole<the second subcomponent<7 moles. According to the composition, a high specific permittivity can be attained, an insulation resistance lifetime can be maintained, the capacity-temperature characteristic can satisfy the X8R characteristic of the EIA standard, and firing in a reducing atmosphere can be realized.

Abstract: A dielectric porcelain composition comprising Ba, Nd, Pr, Bi, Ti and at least one of Na and K and satisfying a condition that when the composition is expressed by composition formula: BaO-aNdO3/2-bPrO11/6-cBiO3/2-dTiO2-eAO1/2, wherein A is at least one of Na and K, and a, b, c, d and e represent a molar ratio, a, b, c, d and e are in respective ranges of 1.5≦a≦2.6, 0.02≦b≦1.00, 0.2≦c≦0.6, 4.5≦d≦5.5 and 0.02≦e≦0.30.

Abstract: 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.

Abstract: A dielectric ceramic composition of high dielectric constant and low dielectric loss, which can be co-fired with Ag electrodes, is provided for use in various parts of electric and electronic appliances.

Abstract: The dielectric ceramic composition of the first aspect of the invention comprises an essential component having a compositional formula of xBaO-yTiO2-zNd2O3 (wherein 0.02≦x≦0.2, 0.6≦y≦0.8, 0.01≦z≦0.3, x+y+z=1), and contains two types of glass powder, one comprising PbO, ZnO and B2O3 and the other comprising SiO2 and B2O3, and a third component that comprises Al2O3, SrTiO3, GeO2 and Li2O. Its advantages are that it can be sintered at low temperatures, its dielectric constant &egr;r falls between 10 and 50 or so, its unloaded Q is large, and its temperature-dependent resonant frequency change is small.

Abstract: 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.

Abstract: 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).

Abstract: 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.

Abstract: 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.

Abstract: Powders of BaCO3, TiO2, ZnO, etc. are mixed to each other at a predetermined ratio of quantity, calcined in an atmospheric air at &pgr;°-120° C., and pulverized to obtain a calcined powder having an average grain size from 1 to 3 &mgr; m, 0.1 to 20 parts-by weight of a powder having an average grain size from 0.1 to 1.5 &mgr;m comprising a glass having a transition point of not higher than 450° C. obtained by mixing powders of Pb3O4, SiO2, Na2O, etc. to each other, melting and then pouring into water and pulverizing the thus obtained glass is admixed to the calcined powder. The mixture is dried, pelleted by adding a resin and the pellet powder is molded into a cylindrical shape, applied with CIP (Cold isotartic press), and the molding product after the treatment is sintered in an atmospheric air at 850° to 1000° C. to obtain a dielectric ceramic sintered at low temperature.