Murata Manufacturing Co., Ltd.

Hiroaki Taira

Yukio Sakabe

Hiroshi Takagi

Yasutaka Sugimoto

Yasunobu Yoneda

Kazutaka Nakamura

Michiaki Iha

Akinori Nakayama

Hiroyuki Matsumoto

Kazuaki Kawabata

Yutaka Shimahara

Akihiro Shimizu

Makoto Yamauchi

Hua-bing Zhou

Tohru Higashi

A highly reliable monolithic ceramic capacitor which has no structural defect, e.g. peeling, and which is not susceptible to water from the outside and a method for manufacturing the same are provided. A lead portion of an internal electrode is configured to have a shape provided with a taper-shaped portion in which the width gradually decreases with increasing proximity to the end surface of a ceramic element, and the shape of the end portion opposite to the lead portion of the internal electrode is adjusted to be substantially rectangular. Regarding a pair of internal electrodes facing each other with the ceramic layer therebetween, the internal electrodes are laminated while the positions thereof are displaced with respect to each other in order that a corner portion in the substantially rectangular portion of one internal electrode are located in the vicinity of, but outside the taper-shaped portion of the other internal electrode.

Laminated ceramic electronic component and method for manufacturing the same

A dielectric ceramic composition is comprised of a dielectric ceramic component represented by the formula: Ba(Zr Zn Ta ) O , wherein, on a molar basis, 0.01&lE;x&lE;0.06, 0.29&lE;y&lE;0.34, 0.60&lE;z&lE;0.70, x&plus;y&plus;z&equals;1, 1.00<&agr;<1.03, and w is an arbitrary number, wherein a is a molar ratio of Zr Zn Ta to Ba; and a glass component containing silicon oxide and boron oxide. This composition can be sintered at a low temperature, and exhibits superior electrical and temperature characteristics. A ceramic electronic component has a dielectric layer composed of this dielectric ceramic composition and a conductive layer.

Dielectric ceramic composition and ceramic electronic component

A dielectric ceramic composition having a high dielectric constant. The dielectric ceramic composition is sinterable at a low sintering temperature and has superior electrical and temperature characteristics. The dielectric ceramic composition comprises 100 parts by weight of a dielectric ceramic component represented by the general formula Ba&lcub;(Co Zn ) Nb &rcub; O , in which, on a molar basis, 0<x<1, 0.313&lE;y<0.333, 0.993&lE;z<1, and w is an optional number, and 1 to 25 parts by weight of a SiO &mdash;B O -based glass component is mixed therewith.

Ceramic composition and ceramic electric device

A solid-electrolyte fuel cell has a three-layered film in which an air electrode is arranged on one surface of a solid-electrolyte film and a fuel electrode is arranged on the other surface, a support layer is bonded to an electrode of the three-layered film, and a collecting layer is bonded with another surface of the support layer and the fuel electrode and the collecting layer, or the air electrode and the collecting layer are electrically connected to each other through holes formed in the thickness direction of the main surface of the support layer.

Solid-electrolyte fuel cell and method for manufacturing the same

A complex oxide ceramic sintered body has a perovskite-type crystal structure and is represented by a general formula: (La,Sr,),(Cr,Al,Co,),O,, where x&plus;z&gE;0.06; z&gE;0.02; x&plus;y&plus;3z&lE;0.25; 2x&plus;3y&plus;5z&gE;0.40; x&plus;y&gE;0.12; and 1.00&lE;b/a&lE;1.04. The sintered body has a relative density of about 94% or more and the bending strength of about 15 kgf/mm,or more both at room temperature and at room temperature after the sintered compact is treated for 24 hours in an atmosphere of humidified hydrogen having an oxygen partial pressure of 10,atm at 1,000&deg; C. The sintered body further has a lattice volumetric expansion coefficient of about 0.3% or less at room temperature after treated for 24 hours in an atmosphere of humidified hydrogen having an oxygen partial pressure of 10,atm at 1,000&deg; C., an average thermal expansion coefficient in a range of about 9.8 to 11.0&times;10,K,at 30 to 1,000&deg; C., and a phase transition temperature, from a rhombic system to a rhombohedral system, of about &minus;20&deg; C. or less.

Complex oxide ceramic sintered body and solid-electrolyte fuel cell comprising the same

A solid oxide fuel cell which has a fuel electrode and an air electrode respectively on a first surface and on a second surface of a solid electrolyte. The interface between the solid electrolyte and the fuel electrode, and the interface between the solid electrolyte and the air electrode are roughened. An exemplary way of toughening the interfaces is as follows: a green sheet of solid electrolyte, a green sheet of fuel electrode and a green sheet of air electrode are laminated with the green sheet of electrolyte in the middle; sandpaper is put on each of the green sheet of fuel electrode and the green sheet of air electrode with a plastic film in-between in such a manner that the rough surfaces of the sandpaper face the green sheets of electrode; the laminate of green sheets is press-fixed, whereby the rough surfaces of the sandpaper roughen the interfaces; and the sandpaper and the plastic films are removed.

Solid oxide fuel cell and manufacturing method thereof

A solid oxide fuel cell which has a fuel electrode and an air electrode respectively on a first surface and on a second surface of a solid electrolyte. The interface between the solid electrolyte and the fuel electrode, and the interface between the solid electrolyte and the air electrode are roughened. An exemplary way of roughening the interfaces is as follows: a green sheet of solid electrolyte, a green sheet of fuel electrode and a green sheet of air electrode are laminated with the green sheet of electrolyte in the middle; sandpaper is put on each of the green sheet of fuel electrode and the green sheet of air electrode with a plastic film in-between in such a manner that the rough surfaces of the sandpaper face the green sheets of electrode; the laminate of green sheets is press-fixed, whereby the rough surfaces of the sandpaper roughen the interfaces; and the sandpaper and the plastic films are removed.

A monolithic type varistor in which a plurality of inner electrodes are arranged in a sintered body composed of semiconductor ceramics so as to be overlapped with each other while being separated by semiconductor ceramic layers. The plurality of inner electrodes are electrically connected to first and second outer electrodes formed on both end surfaces of the sintered body. One or more non-connected type inner electrodes are arranged between adjacent ones of the plurality of inner electrodes and are not electrically connected to the outer electrodes, each of the non-connected type inner electrodes being spaced apart from each adjacent inner electrode or non-connected type inner electrode while being separated therefrom by a semiconductor ceramic layer. Voltage non-linearity is obtained by Schottky barriers formed at the interface of the inner electrode and the semiconductor ceramic layer and the interface of the non-connected type inner electrode and the semiconductor ceramic layer. The value of the number of grain boundaries between semiconductor particles in at least one semiconductor ceramic layer is two or less.

Monolithic type varistor

Respective first end portions of first and second internal electrodes are exposed at respective end surfaces of a varistor body, which is in the form of a rectangular parallelepiped. These end surfaces of the varistor body are covered with low resistance parts which include ceramic material in order to prevent the internal electrodes from decomposition. External electrodes are formed on the low resistance parts, so as, to be electrically connected with corresponding ones of the internal electrodes through the low resistance parts.

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Izumo, Japan

Hiroaki Taira