Abstract: 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.

Abstract: Piezoelectric ceramics include a bismuth layer compound containing MII, Bi, Ti, Ln and O, wherein MII represents at least one element selected from the group consisting of Sr, Ba and Ca, and Ln represents at least one element selected from the group consisting of lanthanoids. The piezoelectric ceramics include MIIBi4Ti4O15 typed crystals, and a mole ratio of Ln/(Ln+MII) is 0<Ln/(Ln+MII)<0.5. In the case where MII is Sr, a mole ratio of 4Bi/Ti is 4.000<4Bi/Ti≦4.030. Preferably, piezoelectric ceramics further include Y oxide.

Abstract: Provided are dielectric ceramics and an electronic component capable of enhancing the longevity of insulation resistance under load at high temperature, namely, the so-called lifetime of IR degradation. A dielectric layer comprises dielectric ceramics containing BaTiO3 that is a main component; a first auxiliary component containing at least one element in a group consisting of Mg, Ca, Ba, Sr and Cr; a second auxiliary component containing SiO2; a third auxiliary component containing at least one element in a group consisting of V, Mo and W; and a fourth auxiliary component containing at least one element in a group consisting of Er, Tm, Yb, Y, Dy and Ho. Preferably, the rate of existence of crystal particles having voids in the dielectric ceramics is 10% or lower in terms of the count rate, and an average crystal particle diameter is more than 0.1 &mgr;m and not more than 0.7 &mgr;m. Thus, the lifetime of IR degradation is improved.

Abstract: A method of manufacturing a dielectric ceramic composition comprising at least BaTiO3 as a main component, a second subcomponent having SiO2 as a main component and at least one type selected from MO (note that M is at least one type of element selected from Ba, Ca, Sr and Mg), Li2O and B2O3 and other subcomponents, comprising the steps of mixing in the main component at least part of other subcomponents except for the second subcomponent to prepare a pre-calcination powder, calcining said pre-calcination powder to prepare a calcined powder, and mixing at least said second subcomponent in said calcined powder to obtain a dielectric ceramic composition having ratios of the subcomponents to BaTiO3 as the main component of predetermined molar ratios.

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: 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.

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) 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: The present invention provides barium titanate semiconductive ceramic having low specific resistance at room temperature and high withstand voltage, which fully satisfies the demand for enhancing withstand voltage. The average ceramic grain size of the barium titanate semiconductive ceramic is controlled to about 0.9 &mgr;m or less. By this control, the ceramic possesses low specific resistance at room temperature and high withstand voltage fully satisfying a recent demand for enhancing withstand voltage and may suitably used for applications such as controlling temperature and limiting current, or in exothermic devices for constant temperature. Accordingly, the barium titanate semiconductive ceramic enables an apparatus using the same to have enhanced performance and reduced size.

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: 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.

Abstract: A method for manufacturing spherical ceramic powder is provided. The method includes essentially a spray drying step and a sintering step. In the spray drying step, a spray nozzle is used to spray slurry containing powdered raw material consisting essentially of ceramic ingredients to form liquid droplets, and liquid contents in the liquid droplets are heated and removed to obtain ceramic granular powder. In the sintering step, the ceramic granular powder is sintered to form spherical ceramic powder. The method provides ceramic powder having a mean particle size of about 1-50 &mgr;m and a sphericity of about 0.8 or higher, which is suited for mixing with resin material to form a compound. The ceramic powder has high dispersant and filling properties against the resin material.

Abstract: 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.

Abstract: A dielectric ceramic material containing BaTiO3 as a primary component and a rare earth element as an additional component, wherein the material satisfies the relation 0.7≦M/N so as to make the density of the rare earth metal uniform between crystal grains, and the material satisfies the relation 0.8≦L/M so as to make the density of the rare earth metal uniform in a crystal grain. In these relations, M represents the number of crystal grains satisfying the relation 0.5≦Di/D; N represents the number of crystal grains constituting the ceramic material; and L represents the number of crystal grains satisfying the relations 0.5≦Di/D and Si/Di≦0.3, wherein Di represents the mean density of the rare earth element in an arbitrary crystal grain i, D represents the mean density of the rare earth element in the entirety of the ceramic material, and Si represents the standard deviation of the density of the rare earth element in the crystal grain i.

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: 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.

Abstract: A multilayered ceramic substrate is produced by laminating and sintering insulating ceramic layers and one or more dielectric ceramic layers. The insulating ceramic layer is composed of a BaO—Al2O3-SiO2 low temperature sintering ceramic material. The dielectric ceramic layer is composed of a dielectric ceramic material containing a dielectric ceramic component represented by BaO—TiO2-(Nd1—mMem)O{fraction (3/2)} wherein Me is a lanthanoid and 0≦m≦1.0, and a glass component of about 20.0 to 65.0 mole percent of barium oxide, about 5.0 to 50.0 mole percent of silicon oxide and about 10.0 to 50.0 mole percent of boron oxide.

Abstract: The present invention provides barium titanate semiconductive ceramic having low specific resistance at room temperature and high withstand voltage, which fully satisfies the demand for enhancing withstand voltage. The average ceramic grain size of the barium titanate semiconductive ceramic is controlled to about 0.9 &mgr;m or less. By this control, the ceramic possesses low specific resistance at room temperature and high withstand voltage fully satisfying a recent demand for enhancing withstand voltage and may suitably used for applications such as controlling temperature and limiting current, or in exothermic devices for constant temperature. Accordingly, the barium titanate semiconductive ceramic enables an apparatus using the same to have enhanced performance and reduced size.

Abstract: 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.

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: 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.

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 capacitor having a ceramic dielectric and at least two electrodes, in which the dielectric is essentially a dielectric ceramic composition of a barium-calcium-manganese-zirconium-titanate having the general formula (Ba1−xCax)yO3 with 0<a≦0.25, 0<b≦0.015, 0.001≦c≦0.01, 0.005≦d≦0.02, 0<x≦0.20, 1.001≦y≦1.014, 0.0005≦z≦0.03 and is characterized by a high capacitance, small dimensions and a long lifetime.

Abstract: 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.

Abstract: 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.

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: 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 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.

Abstract: A dielectric composition containing at least calcium titanate, strontium titanate, and barium titanate, wherein at least the molar ratios of composition of the three are such that the molar ratio of composition (P) of calcium titanate is 0.5 to 0.85, the molar ratio of composition (Q) of strontium titanate is 0.05 to 0.4, and the molar ratio of composition (R) of barium titanate is 0.1 to 0.2 (where, P+Q+R=1).

Abstract: A dielectric ceramic composition comprising a main component of composed mainly of barium titanate, a first subcomponent including at least one compound selected from MgO, CaO, BaO, SrO and Cr2O3, a second subcomponent containing silicone oxide as a main composition, a third subcomponent including at least one compound selected from V2O5, MoO3, and WO3, a fourth subcomponent including an oxide of R1 (where R1 is at least one element selected from Sc, Er, Tm, Yb, and Lu), and a fifth subcomponent including CaZrO3 or CaO+ZrO2, wherein the ratios of the subcomponents to 100 moles of the main component of composed mainly of barium titanate are the first subcomponent of 0.1 to 3 moles, the second subcomponent of 2 to 10 moles, the third subcomponent of 0.01 to 0.5 moles, the fourth subcomponent of 0.5 to 7 moles (where the number of moles of the fourth subcomponent is the ratio of R1 alone), and the fifth subcomponent of 0<fifth subcomponent≦5 moles.

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 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.

Abstract: Disclosed is a dielectric material comprising: 100 parts by weight of a main component having a composition represented by formula: xBaO—yRE2O3—zTiO2, wherein RE represents at least one rare earth element and x+y+z=100 mol %; 5 parts by weight or less of at least one alkali metal oxide; and 5 parts by weight or less of Bi2O3.

Abstract: 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.

Abstract: The invention provides an electronic thin-film material suitable for composing a diffusion preventive layer for use in a ferroelectric capacitor, a ferroelectric capacitor using such diffusion preventive layer composed of the electronic thin-film material, and a non-volatile memory using such ferroelectric capacitor. The ferroelectric capacitor 10 is composed of a diffusion preventive layer made of a CrTa film 2, a lower electrode made of a Pt film 3, a ferroelectric film 4 made of PZT, and an upper electrode made of a Pt film 5, which are sequentially laminated on a surface of a silicon substrate. The CrTa film 2 itself is an alloy film comprising 90-atomic % of Cr and 10-atomic % of Ta, which can be formed via a sputtering process. Inasmuch as the ferroelectric capacitor 10 is composed of the CrTa film 2, it is possible to utilize PZT requiring high-temperature thermal treatment to form the ferroelectric film material.

Abstract: 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.

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) 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.

Abstract: The present invention provides a semiconducting ceramic which possesses a dielectric strength of 800 V/mm or more and a specific resistance at room temperature of 100 &OHgr;·cm or less, the specific resistance at room temperature undergoing substantially no time-course change. The semiconducting ceramic is formed of a sintered semiconducting material containing barium titanate, wherein the average grain size of the semiconducting ceramic is about 1.0 &mgr;m or less and the relative spectral intensity ratio represented by BaCO3/BaO, which is determined by XPS at the surface of the ceramic, is 0.5 or less.

Abstract: 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.

Abstract: 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—zReO{fraction (3/2)} 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.

Abstract: A dielectric ceramic composition exhibiting a firing temperature of 1300° C. or less, a dielectric constant of 200 or more, a low loss under a high-frequency-high-voltage alternating current, high insulation resistance at high electric field strength, characteristics satisfying the B and X7R characteristics, and excellent high-temperature load properties. It contains a barium titanate solid solution and additive components, and is represented by the formula, ABO3+aR and bM, wherein ABO3 represents the barium titanate solid solution having a perovskite structure; R represents an oxide of at least one metal, M represents an oxide of at least one other metal, a and b respectively represent the molar ratios of single metal oxides and a sintering additive, wherein 0.950≦A/B (molar ratio)≦1.050, 0.12<a≦0.30, and 0.04≦b≦0.30.

Abstract: A ceramic for the PTC thermistor having a resistivity at room temperature of 5 &OHgr;·cm or less, static withstanding voltage of 60 V/mm or more and temperature resistance coefficient of 9.0 %/° C., having small dispersion of the resistance, is composed of principal components of about 30 to 97 mol % of BaTiO3, about 1 to 50 mol % of PbTiO3, about 1 to 30 mol % of SrTiO3 and about 1 to 25 mol % of CaTiO3 (the total content of them being 100 mol %), as well as about 0.1 to 0.3 mole of Sm, about 0.01 to 0.03 mole of Mn and 0 to about 2.0 mole of Si relative to 100 moles of the principal components, the composite material being preferably heat-treated in an oxidative atmosphere after being fired in a reducing or neutral atmosphere for obtaining the ceramic.

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 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 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.

Abstract: A dielectric ceramic composition of the present invention is a mixture of barium titanate as a main component whose Ba/Ti molar ratio ranging from 1.001 to 1.05 and sub components comprising, at least 0.5 to 5.0 mol of Mg in the form of MgO, 0.1 to 3.0 mol of Dy in the form of Dy2O3, 0.01 to 0.4 mol of Mn in the form of Mn3O4, 0.01 to 0.26 mol of V in the form of V2O5, 0.3 to 3.5 mol of Si in the form of SiO2 and 0.01 to 3.0 mol of Al in the form of Al2O3 per 100 mol of the barium titanate. Even when external electrodes are made of base metal such as copper or the like, a multilayer capacitor whose dielectric layers are not reduced and have high insulation resistance can be obtained by using the dielectric ceramic composition of the present invention.

Abstract: Provided are dielectric ceramics and an electronic component capable of enhancing the longevity of insulation resistance under load at high temperature, namely, the so-called lifetime of IR degradation. A dielectric layer comprises dielectric ceramics containing BaTiO3 that is a main component; a first auxiliary component containing at least one element in a group consisting of Mg, Ca, Ba, Sr and Cr; a second auxiliary component containing SiO2; a third auxiliary component containing at least one element in a group consisting of V, Mo and W; and a fourth auxiliary component containing at least one element in a group consisting of Er, Tm, Yb, Y, Dy and Ho. Preferably, the rate of existence of crystal particles having voids in the dielectric ceramics is 10% or lower in terms of the count rate, and an average crystal particle diameter is more than 0.1 &mgr;m and not more than 0.7 &mgr;m. Thus, the lifetime of IR degradation is improved.

Abstract: Disclosed is a dielectric material comprising: 100 parts by weight of a main component having a composition represented by formula: xBaO—yRE2O3—zTiO2, wherein RE represents at least one rare earth element and x+y+z=100 mol %; 5 parts by weight or less of at least one alkali metal oxide; and 5 parts by weight or less of Bi2O3.