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US 12,741,911 B2Granted
Dielectric ceramic composition and multilayer ceramic electronic device
AssigneeTaiyo Yuden Co., Ltd.
InventorsKazuki Misawa, Keiichi Hatano
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Abstract
A dielectric ceramic composition includes a first crystal grain that has a perovskite structure expressed by a general formula of BaCaTiO3, and has a core portion and a shell portion surrounding the core portion and including a rare earth element and manganese, and a second crystal grain in which an elemental ratio of total of barium and calcium to titanium is 0.70 or less and a main component is barium calcium titanate.
Claims20
A dielectric ceramic composition comprising:
- a first crystal grain that has a perovskite structure expressed by a general formula of BaCaTiO3, and has a core portion and a shell portion surrounding the core portion and including a rare earth element and manganese;
- and
- a second crystal grain in which an elemental ratio of total of barium and calcium to titanium is 0.70 or less and a main component is barium calcium titanate, the second crystal grain including at least Ba4Ti11O26.
A dielectric ceramic composition comprising:
- a first crystal grain that has a perovskite structure expressed by a general formula of BaCaTiO3, and has a core portion and a shell portion surrounding the core portion and including a rare earth element and manganese;
- and
- a second crystal grain which is barium titanate composite oxide in which an elemental ratio of total of barium and calcium to the barium titanate composite oxide is smaller than an elemental ratio of titanium to the barium titanate composite oxide, the second crystal grain including at least Ba4Ti11O26,
- wherein the second crystal grain includes manganese and has an elemental ratio of manganese to titanium of 0.02 or more and 0.10 or less.
1 more element
Dependencies are inferred from the claim text.