Abstract: A multilayer ceramic capacitor 1 having dielectric layers 2 having barium titanate or barium calcium titanate as a main ingredient. When the dielectric layers are barium titanate, the ratio of the grains having a thickness of the crystal grain boundaries 22 present between adjoining dielectric grains 20 is 30% to 95% of the plurality of dielectric grains 20 forming the dielectric layers 2. When the dielectric layers 2 are barium calcium titanate, the ratio of the grains having a thickness of the crystal grain boundaries 22 present between adjoining dielectric grains 20 is 20% to 70% of the plurality of dielectric grains 20 forming the dielectric layers 2.

Abstract: An object of the present invention is to make a core/shell structured powder different in composition between the inside the particle and the surface thereof before sintering, so that it is possible to sinter the powder at lower temperature and give a core/shell structured powder having a shell portion uniform in thickness after sintering. Another object of the present invention is to provide a multilayered ceramic capacitor having a longer lifetime, by preparing the multilayered ceramic capacitor by using a powder having a core/shell structure different in composition between the inside the particle and the surface thereof before sintering.

Abstract: A ceramic material powder comprised of main ingredient particles formed by barium titanate having on their surfaces a covering layer comprised of a secondary ingredient additive, wherein when an average radius of the main ingredient particles is “r” and an average radius of the covering layer is “?r”, the ?r is controlled to a range of 0015r to 0.055r, thereby enabling acquisition of a multilayer ceramic capacitor or other electronic device satisfying both the X7R characteristic prescribed in the EIAJ standard and B characteristic prescribed in the Japan Industrial Standard (JIS), that is, excellent in temperature stability of the electrostatic capacity, having a good insulation resistance value, relative dielectric constant, or other characteristics, and having a long accelerated life of the insulation resistance.

Abstract: A sintered body comprising a main phase consisting of an R2T14B phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y), and T represents one or more transition metal elements essentially containing Fe, or Fe and Co), and a grain boundary phase containing a higher amount of R than the main phase, wherein a platy or acicular product exists. This sintered body enables to inhibit the grain growth, while keeping a decrease in magnetic properties to a minimum, and to improve a suitable sintering temperature range.

Abstract: A sintered body with a composition consisting of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, provided that the rare earth elements include Y), 0.5% to 4.5% by weight of B, 0.02% to 0.6% by weight of Al and/or Cu, 0.03% to 0.25% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe. This sintered body has a coefficient of variation (CV value) showing the dispersion degree of Zr of 130 or less. In addition, this sintered body has a grain boundary phase comprising a region that is rich both in at least one element selected from a group consisting of Cu, Co and R, and in Zr. This sintered body enables to inhibit the grain growth, while keeping the decrease of magnetic properties to a minimum, and to improve the suitable sintering temperature range.

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 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 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: 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 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: 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: 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 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).