International Superconductivity Technology Center

Mitsubishi Denki K.k.

Osaka Gas Company Limited

Hokkaido Electric Power Company, Inc.

Mitsunobu Wakata

Shoji Tanaka

Nobuyuki Sugii

Hisao Ohnishi

Kazuyuki Hamada

Hisao Yamauchi

Masamichi Ipponmatsu

Shuzo Kudo

Kohichi Kubo

Kiyotaka Matsuura

Satoshi Takano

A nitrogen oxide detecting sensor, according to the present invention, incorporates a gas detecting portion including, as a main component thereof, an oxide compound having electric conductivity or semiconductivity, the oxide compound having a crystal structure of 2212 phase and expressed generally as: Bi.sub.2 Sr.sub.2 (Ca.sub.1-x Y.sub.x)Cu.sub.2 O.sub.8.+-..delta. where 0.6.ltoreq.x&lt;1; 0.ltoreq..delta..ltoreq.1. Electrodes are electrically connected to the gas detecting portion. When the gas detecting portion is analyzed by X-ray diffraction using cuK.alpha. rays to obtain diffraction peak values thereof in the range of a diffraction angle between 5.degree. and 65.degree., the diffraction peak values having a sum .SIGMA. I�2212! expressed by one of the following:

Nitrogen oxide detecting sensor and method of manufacturing the same

Disclosed is a boride material for electronic elements, which is represented by a chemical formula of A.sub.1-x E.sub.x B.sub.12 (where A is Zr of Hf, E is Sc or Y, and 0.1.ltoreq.x.ltoreq.0.9) and the crystal system of which is a cubic one at a temperature not lower than its phase transition temperature and is a hexagonal one at a temperature not higher than its phase transition temperature. The boride material is prepared by mixing oxide powders or sulfate powders of the constitutive elements A and E and a boron powder followed by shaping the powder mixture and then sintering the shaped body.

Boride materials for electronic elements and method of preparing the same

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Tokyo, Japan

Mitsunobu Wakata