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: 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: 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: An inexpensive capacitor for pulse generation whose characteristics do not deteriorate even when the capacitor is used in a high temperature, high vacuum, reducing atmosphere, and which enables generation of high-voltage pulses over a wide temperature range. The dielectric body 1 of the capacitor is constructed of a non-linear dielectric ceramic which exhibits resistance to reduction. The non-linear dielectric ceramic comprises a polycrystalline substance containing barium titanate as a primary component, and when the polycrystalline substance is represented by (1−a−b)ABO3+aM+bR wherein ABO3 is a barium titanate component and represents a perovskite structure, M is an oxide of at least one element selected from the group consisting of Mn, Ni and Co, R is an oxide of at least one element selected from the group consisting of La, Ce, Nd, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er and Yb, and a and b represent mole fractions; A, B, a, and b satisfy the following relationships: 1.000≦A/B≦1.

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 nonreducing dielectric contains a main-component having a perovskite crystal phase and satisfying the formula

Abstract: A non-reducing dielectric ceramic contains Ca, Zr and Ti as metallic elements and does not contain Pb. In a CuK&agr; X-ray diffraction pattern, the ratio of the maximum peak intensity of secondary crystal phases to the maximum peak intensity at 2&thgr;=25° to 35° of a perovskite primary crystal phase is about 12% or less, the secondary crystal phases including all the crystal phases other than the perovskite primary crystal phase. The non-reducing dielectric ceramic exhibits superior insulating resistance and dielectric loss after firing in a neutral or reducing atmosphere and high reliability in a high-temperature loading lifetime test and is useful for producing compact high-capacitance monolithic ceramic capacitors.

Abstract: A dielectric ceramic composition is composed of barium titanate (BamTiO3), a rare-earth oxide (RO3/2), where the rare-earth element is at least one of Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb, calcium oxide and a silicon oxide. When the dielectric ceramic composition is represented by the formula 100BamTiO3+aRO3/2+bCaO+cSiO2, where coefficients 100, a, b, and c indicate moles, the relationships 0.990≦m≦1.030, 0.5≦a≦30, 0.5≦b≦30, and 0.5≦c≦30 are satisfied. A monolithic ceramic capacitor includes a plurality of dielectric ceramic layers, internal electrodes formed between the dielectric ceramic layers and external electrodes electrically connected to the internal electrodes. The dielectric ceramic layers are composed of the dielectric ceramic composition described above, and the internal electrodes are composed of a base metal as a principal constituent.

Abstract: A ceramic capacitor has a dielectric ceramic layer and at least one pair of electrodes. The dielectric ceramic layer has a primary phase and secondary phases, and the size of the secondary phases in the thickness direction of the dielectric ceramic layer is not more than about one-third of the thickness of the dielectric ceramic layer. A method for making the ceramic capacitor includes the steps of mixing compounds constituting secondary phases in a primary phase of a dielectric ceramic, annealing and then pulverizing the mixture to prepare a raw material for the secondary phases, mixing the raw material for the secondary phases with other materials for the dielectric ceramic shaping and sintering the mixture to form a dielectric ceramic, and forming electrodes on the dielectric ceramic. The ceramic capacitor has high insulation resistance, superior load characteristics at high temperatures or high humidity and high weather resistance, even when sintered in a reducing atmosphere.

Abstract: A nonreducing dielectric ceramic has a perovskite structure represented by the formula ABO3 with a principal crystal phase comprising barium titanate as a principal constituent. The crystal axis ratio c/a determined by the X-ray diffraction method at a temperature of−25° C. or more satisfies the relationship 1.000≦c/a≦1.003. Preferably, the nonreducing dielectric ceramic has a phase transition point of less than −25° C. Preferably, the nonreducing dielectric ceramic contains at least one rare-earth element. A monolithic ceramic capacitor including dielectric ceramic layers composed of a nonreducing dielectric ceramic in accordance with the present invention is also disclosed.

Abstract: A dielectric ceramic composition containing a primary component represented by the following formula: {BaO}mTiO2+&agr;M2O3+&bgr;R2O3+&ggr;BaZrO3+gMgO+hMnO wherein M2O3 is at least one of Sc2O3 or Y2O3; R2O3 is at least one member selected from the group consisting of Eu2O3, Gd2O3, Tb2O3. Dy2O3, Ho2O3, Er2O3, Tm2O3 and Yb2O3; &agr;, &bgr;, &ggr;, g or h represent a mole ratio and satisfy specified relations; and silicon oxide as an auxiliary component in an amount of 0.2-5.0 mol as SiO2, with respect to 100 mol of the primary component.

Abstract: An anti-reducing dielectric ceramic composition having a dielectric constant of 100 or higher and excellent reliability during a life measuring test under a high temperature load and a monolithic ceramic capacitor formed by using the improved anti-reducing dielectric ceramic composition. The composition is a composite oxide represented by the composition formula (Ca1−xSrx)m(Zr1−yTiy)O3, 0≦x<0.5, 0.60<y≦0.85 and 0.85<m<1.30 as a main component. Every 100 mols of the main component is mixed with at least one of a manganese compound and a magnesium compound incorporated as an accessory component in a range of about 0.1 to 6 mols, by calculatively converting the manganese compound into MnO and the magnesium compound into MgO. The composition may further contain a sintering auxiliary material such as SiO2.

Abstract: Laminated ceramic parts such as a laminated ceramic condenser and a laminated LC filter are formed by using a temperature compensating dielectric ceramic composition having a high relative dielectric constant and a high Q value, and which can be sintered at a relatively low temperature during the manufacturing processes, without causing any undesired variations in ceramic properties during the sintering treatment. The composition includes 100 parts by weight of a main component having a mole composition ratio (BaO, TiO2, Re2O3) shown in a ternary composition diagram indicated by an area surrounded by point A (39.5. 59.5, 1), point B (1, 59.5, 39.5), point C (1, 85, 14) and point D (14, 85, 1); about 25 parts by weight or less of a lead free B2O3—SiO2 glass; at least one of V oxide (the content as V2O5 being about 10 parts by weight or less) and W oxide (the content as WO3 being about 20 parts by weight or less).

Abstract: A multilayer ceramic capacitor and a process for producing the same, which comprises dielectric ceramic layers, internal electrodes disposed between the dielectric ceramic layers, and an external electrode connected to the internal electrodes, the dielectric ceramic layers comprising barium titanate, a bismuth compound, and an anti-reducing agent, the internal electrodes comprising nickel or a nickel alloy.

Abstract: Disclosed is a dielectric ceramic composition containing an essential component represented by the formula, xBaO-yTiO.sub.2 -zRe.sub.2 O.sub.3, wherein x, y and z are in mol %; x+y+z=100; and (x, y, z) falls within a polygonal region defined by four points of A (39.5, 59.5, 1), B (1, 59.5, 39.5), C (1, 85, 14) and D (14, 85, 1), and further containing V, Cu and Mn as side components in an amount of about 0.1 wt. % to 15 wt. % in terms of V.sub.2 O.sub.5, in an amount not greater than 10 wt. % in terms of CuO, and in an amount not greater than 1 wt. % in terms of MnO, respectively, relative to 100 wt. % of the essential component.

Abstract: A dielectric ceramic composition including: a barium titanate containing principal component represented by the formula: (1-.alpha.-.beta.-.gamma.){BaO}.sub.m .multidot.TiO.sub.2 +.alpha.M.sub.2 O.sub.3 +.beta.Re.sub.2 O.sub.3 +.gamma.(Mn.sub.1-x-y Ni.sub.x Co.sub.y)O wherein M.sub.2 O.sub.3 is at least one of Sc.sub.2 O.sub.3 and Y.sub.2 O.sub.3 ; Re.sub.2 O.sub.3 is at least one of Sm.sub.2 O.sub.3, Eu.sub.2 O.sub.3, and Gd.sub.2 O.sub.3 ; 0.0025.ltoreq..alpha.+.beta..ltoreq.0.025, 0<.beta..ltoreq.0.0075, 0.0025.ltoreq..gamma..ltoreq.0.05, .gamma./(.alpha.+.beta.).ltoreq.4, 0.ltoreq.x<1.0, 0.ltoreq.y<1.0, 0.ltoreq.x+y<1.0, and 1.000<m.ltoreq.1.035, at least one of scandium oxide and yttrium oxide, at least one of samarium oxide, europium oxide and gadolinium oxide, and at least one oxide of magnesium in an amount of from about 0.5 to 5.0 mols calculated as MgO to 100 mols of the principal components and further containing from about 0.2 to 3.0 parts by weight of an Al.sub.2 O.sub.3 --MO--B.

Abstract: A monolithic ceramic capacitor has laminated plural dielectric ceramic layers, internal electrodes disposed between dielectric ceramic layers, and external electrodes formed at edge surfaces of the dielectric ceramic layers such that they are connected to alternate internal electrodes, wherein the dielectric ceramic layers are composed of a material comprising a principal component shown by the formula: (1-.alpha.-.beta.-.gamma.){BaO}.sub.m.TiO.sub.2 +.alpha.M.sub.2 O.sub.3 +.beta.Re.sub.2 O.sub.3 +.gamma.(Mn.sub.1-x-y Ni.sub.x Co.sub.y)O (wherein M.sub.2 O.sub.3 is at least one kind of Sc.sub.2 O.sub.3 and Y.sub.2 O.sub.3 ; Re.sub.2 O.sub.3 is at least one kind of Sm.sub.2 O.sub.3 and Eu.sub.2 O.sub.3 ; 0.0025.ltoreq..alpha.+.beta..ltoreq.0.025, 0<.beta..ltoreq.0.0075, 0.0025.ltoreq..gamma..ltoreq.0.05, .gamma./(.alpha.+.beta.).ltoreq.4, 0.ltoreq.x<1.0, 0.ltoreq.y<1.0, 0.ltoreq.x+y.ltoreq.1.0, and 1.000<m.ltoreq.1,035), and containing definite amounts of MgO and SiO.sub.2 as side components.

Abstract: A monolithic ceramic capacitor composed of laminated plural dielectric ceramic layers, internal electrodes disposed between the dielectric ceramic layers and external electrodes formed at both the edge surfaces of the dielectric ceramic layers such that they are alternately connected to the internal electrodes, wherein the dielectric ceramic layers are composed of a material comprising principal components shown by the formula: (1-.alpha.-.beta.){BaO}.sub.m .cndot.TiO.sub.2 +.alpha.{(1-x)M.sub.2 O.sub.3 +xRe.sub.2 O.sub.3 }+.beta.(Mn.sub.1-y-z Ni.sub.y Co.sub.z)O (wherein M.sub.2 O.sub.3 is at least one of Sc.sub.2 O.sub.3 and Y.sub.2 O.sub.3 ; Re.sub.2 O.sub.3 is at least one of Gd.sub.2 O.sub.3, Tb.sub.2 O.sub.3 and DY.sub.2 O.sub.3 ; 0.0025.ltoreq..alpha..ltoreq.0.025, 0.0025.ltoreq..beta..ltoreq.0.05, .beta./.alpha..ltoreq.4, 0<x.ltoreq.0.50, 0.ltoreq.y<1.0, 0.ltoreq.z<1.0, 0.ltoreq.y+z.ltoreq.1.0, and 1.000<m.ltoreq.1,035), and containing definite amounts of MgO and SiO.sub.

Abstract: A multilayer ceramic capacitor is made of a principal component (100 mol) represented by the compositional formula(1-.alpha.-.beta.) {BaO}.sub.m .multidot.TiO.sub.2 +.alpha.Re.sub.2 O.sub.3 +.beta.(Mn.sub.1-x-y Ni.sub.x CO.sub.y)O(where Re.sub.2 O.sub.3 is at least one of Y.sub.2 O.sub.3, Tb.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Ho.sub.2 O.sub.3, Er.sub.2 O.sub.3 and Yb.sub.2 O.sub.3 ; and .alpha., .beta., m, x, and y are 0.0025 .ltoreq..alpha..ltoreq.0.025, 0.0025 .ltoreq..beta..ltoreq.0.05, .beta./.alpha..ltoreq.4, 0 .ltoreq.x <1.0, 0 .ltoreq.y <1.0, 0 .ltoreq.x +y<1.0, and 1.000<m.ltoreq.1.035.), a secondary component (about 1-3.0 mol) of magnesium oxide (MgO), and Al.sub.2 O.sub.3 -MO-B.sub.2 O.sub.3 oxide glass (where MO is at least one of BaO, CaO, SrO, MgO, ZnO and MnO) in an amount of about 0.2-3.0 parts by weight for 100 parts by weight of the total amount of said principal component and secondary component.

Abstract: A multilayer ceramic capacitor and a process for producing the same, which comprises dielectric ceramic layers, internal electrodes disposed between the dielectric ceramic layers, and an external electrode connected to the internal electrodes, the dielectric ceramic layers comprising barium titanate, a bismuth compound, and an anti-reducing agent, the internal electrodes comprising nickel or a nickel alloy.