Kyocera Corporation

Kiyoshi Matsubara

Youichi Yamazaki

Daisuke Fukuda

Kousei Kamigaki

Masahiro Nishigaki

Yoshihiro Fujioka

Yumiko Itoh

Kenichi Iwasaki

Hiromi Seki

The invention provides a multilayer ceramic capacitor comprising a capacitor body composed by alternately layering dielectric layers and inner electrode layers. Accordingly, the multilayer ceramic capacitor has high relative permittivity and is high the temperature property and highly accelerated life test property.

Multilayer ceramic capacitor and production method of the same

A multilayer ceramic capacitor includes a plurality of ceramic dielectric layers, a plurality of inner electrode layers and and external electrodes. The ceramic dielectric layers includes barium titanate crystal grains having pores inside. The inner electrode layers are between the ceramic dielectric layers. The external electrodes are electrically connected to the inner electrode layers. The barium titanate crystal grains each have a core-shell structure which include a core and a shell around the core. The the pores are mainly formed in the cores.

Multilayer ceramic capacitor

Provided is a multilayer ceramic capacitor having a capacitor body formed by alternately laminating a dielectric layer and an internal electrode layer, and an external electrode formed on both ends of the capacitor body. The dielectric layer has at least two type of barium titanate crystal grains that differ from one another in at least one selected from Ca composition concentration, Sr composition concentration, and Zr composition concentration, and a grain boundary phase. If this multilayer ceramic capacitor employs, as a dielectric layer, a dielectric ceramic that contains barium titanate crystal grains in which part of Ba is substituted by Ca, Sr, or Zr, it is capable of suppressing the grain growth of crystal grains, and improving relative dielectric constant, temperature characteristic, and high-temperature load test characteristic, for example, in high-volume manufacturing using a tunnel type large kiln.

Multilayer ceramic capacitor and method for manufacturing the same

Crystal grains mainly composed of barium titanate have a mean grain size of not more than 0.2 &#x3bc;m. The volume per unit cell V that is represented by a product of lattice constant (a, b, c) figured out from the X-ray diffraction pattern of the crystal grains is not more than 0.0643 nm. Thereby, a dielectric ceramics having high relative dielectric constant can be obtained. A multilayer ceramic capacitor comprises a capacitor body and an external electrode that is formed at both ends of the capacitor body. The capacitor body comprises dielectric layers composed of the dielectric ceramics, and internal electrode layers. The dielectric layers and the internal electrode layers are alternately laminated.

Dielectric ceramics, multilayer ceramic capacitor and method for manufacturing the same

A multilayer ceramic capacitor comprises a dielectric layer and an internal electrode layer that are alternately laminated. Barium titanate particles containing an alkaline earth metal component except for Ba in a proportion of not more than 0.2 atomic % (BMTL), and barium titanate particles containing an alkaline earth metal component except for Ba in a proportion of not less than 0.4 atomic % (BMTH) coexist in the dielectric layer in an area ratio of BMTL to BMTH of 0.1 to 9. This provides excellent reliability of capacity temperature characteristic and high-temperature load lifetime, if the dielectric layer is thinned.

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Kirishima, Japan

Kiyoshi Matsubara