Murata Manufacturing Co., Ltd.

Shinya Isota

Tomotaka Hirata

Masahiro Naito

Hitoshi Nishimura

Yuta Oshima

Yasuhiro Nishisaka

Masanori Nakamura

Akira Kato

Shoichiro Suzuki

Takehisa Sasabayashi

Kazuhisa Uchida

Toshihiro Okamatsu

Hideyuki Hashimoto

Tatsuya Izumi

Sho Watanabe

Taketsugu Ogura

Yuya Ogawa

A multilayer ceramic capacitor includes an element body portion and a pair of outer electrodes on first and second end surfaces and connected to inner electrode layers. The element body portion includes first and second side margin portions, and first and second outer layer portions, and an inner layer portion. A dielectric includes dielectric particles including barium and titanium, and, as sub-components, rare earth elements, and one or more first additional elements. In a cross section crossing a center in a length direction, dielectric layers included in an inner layer portion include core-shell particles and uniform solid solution particles. A ratio of average areas occupied by the core-shell particles and the uniform solid solution particles is about 0.8 to about 1.5, and a coefficient of variation of a first additional element concentration in the uniform solid solution particles is equal to or less than about 20%.

Multilayer ceramic capacitor

A multilayer ceramic capacitor includes a base body including first and second main surfaces, first and second side surfaces, first and second end surfaces, and dielectric layers and internal electrode layers, and external electrodes at the first and second end surfaces, and electrically connected to the internal electrode layers. The base body includes an inner layer, first and second outer layers, first and second side margin portions. The dielectric layers in the inner layer and the first and second outer layers include main crystal grains including barium and titanium, and with respect to 100 parts by mol of titanium, nickel in an amount of about 0.2 to about 3.0 parts by mol, and at least one rare earth element selected from yttrium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium in an amount of about 0.6 parts to about 2.0 parts by mol.

A multilayer ceramic capacitor that includes a ceramic body including a stack of a plurality of dielectric layers and a plurality of internal electrodes; a first external electrode on a first end surface of the ceramic body and electrically connected to a first set of the plurality of internal electrodes; and a second external electrode on a second end surface of the ceramic body and electrically connected to a second set of the plurality of internal electrodes. The dielectric layer includes a plurality of dielectric grains including Ca, Zr, Ti and a rare earth element, P is present between the plurality of dielectric grains, and where at least a portion of the rare earth element is in a solid solution in the dielectric grains.

A multilayer ceramic capacitor that includes a laminate which has a plurality of dielectric layers and a plurality of internal electrode layers respectively laminated. The dielectric layers are a perovskite type structure containing Ba, Sr, Zr, Ti and Hf, and optionally Ca, and further include V, wherein (number of moles of Sr)/(number of moles of Ba+number of moles of Ca+number of moles of Sr) is 0.6 to 0.95, (number of moles of Zr)/(number of moles of Zr+number of moles of Ti+number of moles of Hf) is 0.9 to 0.98, thicknesses of the dielectric layers are 1 &#x3bc;m or less, and an average particle size of dielectric particles constituting the dielectric layers is 0.8 &#x3bc;m or less.

A laminated body that contains a perovskite-type compound containing Sr, Ba, Zr, and Ti and containing; Si; Mn; Al; and V. When the total content of Zr and Ti is 100 parts by mol, the total content m of Sr and Ba meets 100&#x2266;m&#x2266;105, the Si content a meets 0.1&#x2266;a&#x2266;4.0, the Mn content b meets 0.1&#x2266;b&#x2266;4.0, the Al content c meets 0.01&#x2266;c&#x2266;3.0, the V content d meets 0.01&#x2266;d&#x2266;0.3, the molar ratio w of Sr and Ba to Sr meets 0.60&#x2266;w&#x2266;0.95, the molar ratio z of the total of Zr and Ti to Zr meets 0.92&#x2266;z&#x2266;0.98, w and y meets and the crystal grains are 1.2 &#x3bc;m or less in average grain size.

Laminated ceramic capacitor and manufacturing method therefor

laminated ceramic capacitor which has favorable moisture resistance includes an inner layer section that has dielectric ceramic layers and internal electrodes stacked alternately, and outer layer sections formed outside the inner layer section. The dielectric ceramic layers have a perovskite-type compound including a main constituent containing Ca and Zr, and an additive containing Si and Mn. The average grain size in the dielectric ceramic layers constituting the outer layer sections is smaller than the average grain size in the dielectric ceramic layers constituting the inner layer section. The Si/Mn molar ratio in the dielectric ceramic near the interfaces between the internal electrodes and the dielectric ceramic layers is &#x2266;15.

Laminated ceramic capacitor

A laminated ceramic capacitor which has a dielectric ceramic with a high dielectric constant and has excellent reliability against changes in temperature and mechanical shocks, even when dielectric ceramic layers are reduced in thickness employs a dielectric ceramic containing (BaCa)TiO(where 0.045&#x2266;x&#x2266;0.15 and 0.98&#x2266;y&#x2266;1.05) as its main constituent and containing ReO(where Re is at least one of Gd, Dy, Ho, Yb, and Y), MgO, MnO, VO, and SiOas accessory constituents, which is represented by the general formula: 100(BaCa)TiO+aReO+bMgO+cMnO+dVO+eSiO, and satisfies each of the following conditions: 0.65&#x2266;a&#x2266;1.5; 0.98&#x2266;y&#x2266;1.05; 0.15&#x2266;b&#x2266;2.0; 0.4&#x2266;c&#x2266;1.5; 0.02&#x2266;d&#x2266;0.25; and 0.2&#x2266;e&#x2266;3.0.

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Nagaokakyo, Japan

Shinya Isota