DIELECTRIC CERAMIC COMPOSITION AND LAMINATED CERAMIC CAPACITOR: Fid-Bau Portal

DIELECTRIC CERAMIC COMPOSITION AND LAMINATED CERAMIC CAPACITOR

SAKURAI DAN / KANEKO TOSHIHIKO / MORIGASAKI NOBUTO / TAKAHASHI TOSHINARI / ITO YASUHIRO

To provide a dielectric ceramic composition having good characteristics, especially good IR characteristics and high-temperature load life even under high electric field intensity.SOLUTION: There is provided a dielectric ceramic composition comprising a main component composed of a perovskite compound represented by the compositional formula (BaSrCa)(TiZr)O) (wherein, all of the m, x, y and z represent a molar ratio and satisfy 0.9≤m≤1.1, 0≤x≤0.5, 0≤y≤0.3, 0≤(x+y)≤0.6 and 0.03≤z≤0.3) and a first sub-component composed of an oxide of a rare earth element R, wherein the dielectric ceramic composition comprises dielectric particles and a grain boundary, the dielectric particles contain all solid solution particles in which a rare earth element and Zr are solid-solved in the entire dielectric particles and when the concentration of the Ti atom in the dielectric ceramic composition is defined as 100 atm%, the concentration of a rare earth element R is defined as Ra and when the concentration of the Ti atom in all solid solution particles is defined as 100 atm%, the average concentration of Zr is defined as Zb and the average concentration of the rare earth element R is defined as Rb, the expressions, 0.82<(Rb/Ra) and 0.6<(Rb/Zb)<1.0 are satisfied.SELECTED DRAWING: None

【課題】高電界強度下においてもＩＲ特性及び高温負荷寿命の良好な誘電体磁器組成物の提供。【解決手段】組成式（Ｂａ１−ｘ−ｙＳｒｘＣａｙ）ｍ（Ｔｉ１−ＺＺｒＺ）Ｏ３で表されるペロブスカイト型化合物（但し、ｍ、ｘ、ｙ、ｚはモル比を示し、０．９≦ｍ≦１．１、０≦ｘ≦０．５、０≦ｙ≦０．３、０≦（ｘ＋ｙ）≦０．６、０．０３≦ｚ≦０．３）からなる主成分と、希土類元素Ｒの酸化物からなる第１副成分を含み、誘電体磁器組成物は誘電体粒子と粒界を含み、誘電体粒子は希土類元素及びＺｒが誘電体粒子全体に固溶している全固溶粒子を含み、誘電体磁器組成物におけるＴｉ原子の濃度を１００原子％とした場合の、希土類元素Ｒの濃度をＲａとし、全固溶粒子におけるＴｉ原子の濃度を１００原子％とした場合の、Ｚｒの平均濃度をＺｂ、希土類元素Ｒの平均濃度をＲｂとした際に、０．８２＜（Ｒｂ／Ｒａ）、０．６＜（Ｒｂ／Ｚｂ）＜１．０を満足する。【選択図】なし

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