Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Kazuki Hirata

Atsuo Nagai

Kenji Oka

Kazuhiro Komatsu

Tadashi Onomi

A dielectric ceramic composition containing at least 0.15 to 2.5 mol of a Mg compound in terms of MgO, 0 to 1.6 mol of a Ba compound in terms of BaCO, 0.1 to 3.0 mol of a Ln (Ln includes two or three kinds of elements selected from Er, Dy, and Ho with Er being essential) compound in terms of LnO, 0.01 to 0.4 mol of a Mn compound in terms of MnO, 0.01 to 0.26 mol of a V compound in terms of VO, 0.3 to 3.5 mol of a Si compound in terms of SiO, and 0.01 to 2.5 mol of an Al compound in terms of AlOto 100 mol of barium titanate adjusted for a Ba/Ti molar ratio of 0.997 to 1.007.

Dielectric porcelain composition, and method for manufacturing capacitor using the same

A method of manufacturing a multilayer ceramic capacitor includes the steps of: preparing a mixture of a raw material powder mainly composed of barium titanate particles; forming the mixture and a binder into a green sheet; alternately layering the green sheet and an internal electrode to obtain a laminated body; and sintering the laminated body. The step of preparing the mixture includes the steps of: introducing the raw material powder and the dispersion medium into a mixing container, and stirring them with balls serving as a mixing medium, to obtain a slurry containing a raw material powder mixture; and drying the slurry. The mixing medium has a diameter that is equal to or less than 400 times the mean particle size of the barium titanate particles of the raw material. The present invention provides a multilayer ceramic capacitor having good DC bias characteristics by suppressing the variation in crystal particles.

Method for manufacturing multilayer ceramic capacitor

The present invention relates to a method of manufacturing a multilayer ceramic capacitor, having the steps of: (a) alternately layering internal electrodes and ceramic green sheets containing a ceramic material having barium titanate to form a laminated body; (b) sintering the laminated body to obtain a sintered body; and (c) forming an external electrode on end faces of the sintered body to obtain a multilayer ceramic capacitor. The barium titanate has a diffraction line derived from (002) plane and a diffraction line derived from (200) plane in an X-ray diffraction chart. The ratio I/Iof peak intensity Iat 2&#x3b8;to diffraction intensity Iat a midpoint angle between peak angle 2&#x3b8;of the diffraction line derived from the (002) plane and peak angle 2&#x3b8;of the diffraction line derived from the (200) plane is 2 to 10. The product r&#xb7;Sa of mean particle size r (&#x3bc;m) of the barium titanate and specific surface area Sa (m/g) is 1 to 2.

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Osaka, Japan

Kazuki Hirata