Taiyo Yuden Co., Ltd.

Taiyo Yuden Kabusikigaisha

Hirokazu Chazono

Hiroshi Kishi

Hisamitsu Shizuno

Hiroshi Saito

Mutsumi Honda

Minoru Oshio

Shunji Murai

Toshiya Nakamura

Kenji Saito

Masami Fukui

Takeshi Wada

Chie Kawamura

Yasuyuki Inomata

Youichi Mizuno

Atsushi Tanada

Yoichi Mizuno

Katsuyuki Horie

Yasuhisa Kono

Toshikazu Toba

Koichiro Morita

Kazuyuki Shibuya

Yoshikazu Okino

Yasunobu Kawamoto

Nobuhiro Sasaki

Hirosi Saito

Hirosi Kisi

Noriyuki Kohzu

A ceramic powder having a perovskite structure is manufactured by synthesizing a ceramic powder by a dry synthesis process and then heat-treating the synthesized ceramic powder in a solution. The dry synthesis method includes a solid phase synthesis method, an oxalate method, a citric acid method and a gas phase synthesis method.

Perovskite ceramic powder and electronic component using same and manufacturing methods thereof

A multilayer displacement element is formed by alternately stacking a plurality of ceramic layers and a multiplicity of internal electrodes, wherein each of the ceramic layers is composed of ceramic grains containing barium titanate as a main component and each of the internal electrodes is a metallic film with a mesh shape. The meshed shape of metallic films leads to a reduced contact area between the metallic films and the ceramic layers. Therefore, the displacement of the ceramic layers can be less restricted by the metallic films and thus the amount of displacement of the ceramic layers can be increased. The ceramic grains preferably have an average diameter equal to or larger than 3.5 &#x3bc;m and it is desirable that the ratio of one grain to one layer for the ceramic layer be equal to or larger than 20%.

Multilayer displacement element

A method for manufacturing a multilayer ceramic capacitor includes the steps of forming a ceramic slurry, forming ceramic green sheets from the ceramic slurry, printing internal electrode patterns on the ceramic green sheets, generating a laminated body by stacking the ceramic green sheets provided with the internal electrode patterns printed thereon, dicing the laminated body to thereby form chip-shaped ceramic bodies and sintering the chip-shaped ceramic bodies. The ceramic slurry includes a glass component containing one or more additive elements selected from the group consisting of Mn, V, Cr, Mo, Fe, Ni, Cu and Co.

Method for manufacturing a multilayer ceramic capacitor

A multilayer ceramic capacitor includes sintered laminated bodies having a plurality of dielectric layers alternately stacked with a multiplicity of internal electrodes, and a pair of external electrodes electrically coupled to the internal electrodes. The dielectric layer is of sintered ceramic grains. The ceramic grains include a core portion surrounded by a shell portion or a solid solution. The ceramic grains contain additive elements such as acceptor elements and/or rare earth elements. The additive elements are non-uniformly distributed in the core and/or shell portion of the ceramic grain or in the solid solution. Such non-uniform distribution of the additive elements in ceramic grains promotes or facilitates the re-oxidation process of the ceramic grains and also increases electrical resistance thereof. Accordingly, the operating life characteristics of the multilayer ceramic capacitors, especially those incorporating therein thin dielectric layers, can be improved.

Multilayer ceramic capacitor and method for the manufacture thereof

A multi-layer capacitor includes a plurality of dielectric layers, a pair of external electrodes and a multiplicity of internal electrode layers, each internal electrode layer being interposed between every two neighboring dielectric layers. Said two neighboring internal electrode layers and the dielectric layer disposed therebetween form a unit capacitor so that the multiplicity of internal electrode layers and the dielectric layers therebetween constitute a stack of three or more vertically stacked unit capacitors. The electrostatic capacitance of the unit capacitor located at a center of the stack is greater than those of the unit capacitors located at an is upper end and a lower end of the stack.

Multi-layer capacitor and method for manufacturing same

A multilayer ceramic capacitor is formed by alternately stacking a plurality of dielectric layers and a multiplicity of internal electrodes, which are connected to a pair of external electrodes. Each of the dielectric layers is obtained from a dielectric ceramic compound composed of ceramic grains and a glass component connecting the ceramic grains, and the glass component contains one or more additive elements in a form of a solid solution. The additive elements are selected from the group consisting of Mn, V, Cr, Mo, Fe, Ni, Cu and Co.

Multilayer ceramic capacitor and method for manufacturing same

A ceramic capacitor containing at least one dielectric layer formed from a dielectric ceramic composition comprising a sintered body containing ceramic particles having a core/shell structure in an amount of 15% or more based on the total ceramic particles of the sintered body, the core/shell structured particle being composed of a core portion, which is BaTiO crystal, and a shell portion surrounding the core portion, which is made of a solid solution comprising BaTiO as a major component, has excellent temperature characteristics and a long life-time.

Dielectric ceramic composition and ceramic capacitor

A multilayer ceramic capacitor includes sintered laminated bodies having a plurality of dielectric layers alternately stacked with a multiplicity of internal electrodes, and a pair of external electrodes electrically coupled to the internal electrodes. The dielectric layer is of sintered ceramic grains. The ceramic grains include a core portion surrounded by a shell portion or a solid solution. The ceramic grains contain additive elements such as acceptor elements and/or rare earth elements. The additive elements are non-uniformly distributed in the core and/or shell portion of the ceramic grain or in the solid solution. Such non-uniform distribution of the additive elements in ceramic grains promotes or facilitates the re-oxidation process of the ceramic grains and also increases electrical resistance thereof. Accordingly, the operating life characteristics of the multilayer ceramic capacitors, especially those incorporating therein thin dielectric layers, can be improved. As a result, the thickness of dielectric layers can be further reduced and a greater number of dielectric layers can be used in forming multilayer ceramic capacitors, enabling miniaturization and large capacitance thereof to be achieved.

A multilayer ceramic capacitor includes a multilayer ceramic body having alternately stacked ceramic layers and internal electrodes, the ceramic layers containing therein an acceptor representing one or more metallic elements for facilitating a reoxidation process of the multilayer ceramic body, and a pair of external electrodes installed at two opposite sides of the multilayer ceramic body, wherein the acceptor concentration in the ceramic layers stacked at a central portion of the multilayer ceramic body is higher than that in the remaining ceramic layers of the multilayer ceramic body.

A multilayer ceramic capacitor comprises dielectric ceramic layers and conductive layers, the dielectric ceramic layers including core-shell structured ceramic particles. The ceramic particles disposed nearer to the conductive layers have shell portions having thickness larger than those of the ceramic particles disposed farther from the conductive layers.

Multilayer ceramic capacitor and manufacturing method thereof

A multilayer ceramic capacitor includes a substantially cuboid-shaped laminated body formed with alternately stacked conductive layers and ceramic dielectric layers, and a pair of external electrodes respectively disposed at opposite end portions of the laminated body. The conductive layers are corrugated, and each of the conductive layers has a nonuniform and spatially varying thickness. Thus the surface area of the conductive layers is substantially increased, which in turn results in the increment of the electrostatic capacitance of the multilayer ceramic capacitor. Further, interrupted regions having the layer thickness of zero are formed on the conductive layer and since the boundary portions are pointed toward neighboring conductive layers, a strong electric field is formed threat. Accordingly, the electrostatic capacitance becomes increased.

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Tokyo, Japan

Hirokazu Chazono