International Superconductivity Technology Center

Ishikawajima-harima Jukogyo Kabushiki Kaisha

Nippon Mining Co., Ltd.

Nippon Steel Corporation

Kabushiki-gaisha Arubakku Kohporehtosentah

Kabushiki-gaisha Arubakku Kohporehiosentah

Yu Shiohara

Shoji Tanaka

Hirohiko Murakami

Junya Nishino

Seiji Yaegashi

Hiroyuki Fujimoto

Masato Murakami

Naoki Koshizuka

Terutsugu Oyama

The present invention relates to a process for preparing an oxide superconductor having a high critical current density, a uniform structure and an excellent mechanical property and thermal stability, which comprises heating raw material powders of a REBaCuO system at 1050.degree. C. or higher, cooling the material for solidification, pulverizing and mixing the solidified material to homogeneously disperse the structure of the solidified material, molding the material, optionally mixed with silver oxide or silver, into a predetermined shape, and reheating the molding to 1050.degree. C. or higher to grow a superconducting phase.

Process for preparing oxide superconductor

A method of producing a superconductor of metal oxides having the following composition:

Method of producing YBa.sub.2 Cu.sub.4 O.sub.x -type superconducting

A method of producing a superconductor of metal oxides which includes subjecting an organic solvent solution containing (a) an alkoxide of a rare earth element, (b) an alkoxide of an alkaline earth metal and (c) copper alkoxide or cupric nitrate to hydrolysis in the presence of water and nitrate ions, thereby forming a mixture containing a gel-like substance. The gel-like substance is, after being dried and formed into a desired shape, pyrolyzed at a temperature of 600.degree.-950.degree.C. to form a superconductor of oxides of the rare earth, the alkaline earth metal and copper.

Method of producing superconductor of metal oxides

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Tokyo, Japan

Yu Shiohara