Tdk Corporation

Dan Sakurai

Nobuto Morigasaki

Yasuhiro Ito

Toshihiko Kaneko

Takuma Ariizumi

Tatsuya Ishii

Toshinari Takahashi

Sanshiro Aman

Takashi Kojima

Masakazu Hosono

Mari Miyauchi

Kosuke Takano

Shinsuke Hashimoto

Satoshi Takagi

Toshihiro Iguchi

Masayuki Tamura

Taku Murakami

Yuki Kamada

A dielectric ceramic composition includes a barium titanate, an oxide of an R element, an oxide of an M element, and an oxide containing Si. The R element is one or more elements selected from Eu, Gd, Tb, Dy, Y, Ho, and Yb. The M element is one or more elements selected from Mg, Ca, Mn, V, and Cr. A ratio of an amount of the oxide of the R element in terms of ROto an amount of the oxide containing Si in terms of SiOis 0.8:1 to 2.2:1. A ratio of an amount of the oxide of the M element in terms of MO to the amount of the oxide containing Si in terms of SiOis 0.2:1 to 1.8:1.50% or more of the number of dielectric particles constituting the dielectric ceramic composition is core-shell dielectric particles having a core-shell structure.

Dielectric ceramic composition and electronic device

A dielectric ceramic composition contains dielectric particles containing a main component represented by a composition formula (BaSrCa)(TiZr)Oand grain boundaries present between the dielectric particles. The values of m, x, y, and z in the composition formula are all molar ratios. In the composition formula, 0.9&#x2264;m&#x2264;1.4, 0&#x2264;x&#x3c;1.0, 0&#x3c;y&#x2264;1.0, 0.9&#x2264;(x+y)&#x2264;1.0, and 0.9&#x2264;z&#x2264;1.0 are satisfied. The dielectric particles contain specific structural particles having a predetermined intragranular structure, and each of the specific structural particles intragranularly includes a first region and a second region having different Ca concentrations from each other. C2/C1 is less than 0.8 in which C1 is an average value of the Ca concentration in the first region and C2 is an average value of the Ca concentration in the second region.

Dielectric ceramic composition and electronic component

The object of the present invention is to provide the multilayer ceramic capacitor having no deterioration of dielectric properties even in case an inhibitor of an internal electrode layer is pushed out to a dielectric layer when sintering. The multilayer ceramic capacitorincluding a capacitor element bodycomprising a dielectric layerand an internal electrode layerstacked in an alternating manner, wherein

Multilayer ceramic capacitor having a capacitor element body inculding a dielectric layer and an internal electrode layer

The object of the present invention is to provide a dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime. The dielectric ceramic composition of the present invention has a main component made of a perovskite type compound expressed by a compositional formula of (BaSrCa)(TiZr)O(note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9&#x2264;m&#x2264;1.1, 0&#x2264;x&#x2264;0.5, 0&#x2264;y&#x2264;0.3, 0&#x2264;(x+y)&#x2264;0.6, and 0.03&#x2264;z&#x2264;0.3), and

Dielectric ceramic composition and multilayer ceramic capacitor

A dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime, even under high electric field intensity. A dielectric ceramic composition having a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9&#x3c;m&#x3c;1.1, 0&#x3c;x&#x3c;0.5, 0&#x3c;y&#x3c;0.3, 0&#x3c;(x+y)&#x3c;0.6, and 0.03&#x3c;z&#x3c;0.3), and a first sub component made of an oxide of a rare earth element R (note that, R is at least one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), wherein the dielectric ceramic composition includes dielectric particles and a particle boundary.

A dielectric ceramic composition having good characteristic even under high electric field intensity, and particularly good IR characteristic and high temperature accelerated lifetime. The present invention is a dielectric ceramic composition comprising,

The object of the present invention is to provide the dielectric ceramic composition having good characteristics even under the high electric field intensity, and particularly good IR characteristic and the high temperature accelerated lifetime. The dielectric ceramic composition according to the present invention comprises a main component comprising a perovskite type compound shown by a compositional formula (BaSrCa)(TiZr)O(note that, said 'm', 'x', &#x201c;y&#x201d; and &#x201c;z&#x201d; all show a mol ratio, and each satisfies 0.94&#x2264;m&#x2264;1.1, 0&#x2264;x&#x2264;0.2, 0&#x2264;y&#x2264;0.2, 0.06&#x2264;z&#x3c;0.2),

A dielectric ceramic composition has good characteristics even under the high electric field intensity, and particularly good IR characteristic and the high temperature accelerated lifetime. The dielectric ceramic composition has a main component having a perovskite type compound shown by a compositional formula (BaSrCa)(TiZr)O, a first sub component having oxides of a rare earth element R, a second sub component as a sintering agent, wherein the dielectric particles has dielectric particles having high diffusion rate of the rare earth element, preferably of a complete solid solution particle, and when a concentration of Ti atom in the diffusion phase is 100 atom %, then an average concentration of the rare earth element R in the diffusion phase is 5 atom % or more, and an average concentration of Zr in the diffusion phase is 10 atom % or more.

A dielectric ceramic composition comprises a main component composed of at least one selected from BaTiO, (Ba, Ca)TiO, (Ba, Sr)TiOand (Ba, Ca, Sr)TiO, an oxide of rare earth element and a composite compound including Ba. 9 to 13 mol of the composite compound in terms of composite compound is included in the dielectric composition. The dielectric ceramic composition includes surface diffusion particles having surface diffusion structure composed of non diffusion phase and diffusion phase including rare earth element. In the surface diffusion particle, when an area of the non diffusion phase is defined as S1, an area of the diffusion phase is defined as S2, S1 and S2 satisfy a relation of S1:S2=20:80 to 30:70 (Note that, except S1=30 and S2=70), when an average concentration of the rare earth element in the surface diffusion particle is defined as C, S2 and C satisfy a relation of 4.8&#x2266;S2&#xd7;C&#x2266;5.8. By the present invention, dielectric ceramic composition which improves reliability with obtaining good specific permittivity and temperature characteristic and electronic component to which the dielectric ceramic composition is applied can be obtained.

A dielectric ceramic composition comprises a main component including BaTiO, a first subcomponent including BaZrO, a second subcomponent including an oxide of Mg, a third subcomponent including an oxide of rare earth, a fourth subcomponent including an oxide of at least one element selected from Mn, Cr, Co and Fe, and a fifth subcomponent including an oxide of at least one element selected from Si, Al, Ge, B and Li. At least a part of dielectric particles constituting the dielectric ceramic composition comprises a surface diffusion structure comprised of a central layer and a diffusion layer therearound. CR and CRmax, respectively defined as a concentration of said 'R' in a proximity point to a boundary face of the dielectric particle and a maximum concentration of the 'R' in the diffusion layer, satisfy a relation of CRmax/CR&#x3e;1. Also, CM and CMmax, respectively defined as a concentration of said Mg in a proximity point to a boundary face of the dielectric particle and a maximum concentration of Mg in the diffusion layer, satisfy a relation of CMmax/CM&#x3e;1.

The invention aims at providing a dielectric ceramic composition including BaTiOwhere 'm' satisfies 0.99&#x2266;m&#x2266;1.01 and BaZrOwhere 'n' satisfies 0.99&#x2266;n&#x2266;1.01, an oxide of Mg, an oxide of R where R is at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, an oxide of at least one element selected from Mn, Cr, Co and Fe, and an oxide of at least one element selected from Si, Li, Al, Ge and B. 35 to 65 moles of BaZrO, 4 to 12 moles of an oxide of Mg, 4 to 15 moles of an oxide of R, 0.5 to 3 moles of an oxide of Mn, Cr, Co and Fe, and 3 to 9 moles of an oxide of Si, Li, Al, Ge and B are included therein per 100 moles of the BaTiO.

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Tokyo, Japan

Dan Sakurai