Mitsubishi Denki Kabushiki Kaisha

Mitsunobu Wakata

Shigeru Matsuno

Yoshio Kubo

Shinichi Kinouchi

Kunihiko Egawa

Toshio Umemura

Kiyoshi Yoshizaki

Ayumi Nozaki

Shin Utsunomiya

Fumio Fujiwara

Syouji Miyashita

A method for manufacturing the oxide superconductor according to the present invention comprises the steps of: mixing a starting material including Bi, Sr, Ca and Cu such that a mole ratio of Bi, Sr, Ca and Cu is 2:2+a:1+b:2+c, wherein a.gtoreq.0, b.gtoreq.0, c.gtoreq.0, and 0&lt;a+b+c&lt;3; melting the mixed material at a temperature of 900.degree. C.-1500.degree. C.; quenching rapidly the molten material; and annealing the quenched material at a partial molten temperature of 800.degree. C.-1000.degree. C. This method gives product wherein a precipitate of at least one compound in the group SrO, CuO and (Ca.sub.1-x Sr.sub.x).sub.2 CuO.sub.3 (wherein 0.gtoreq.x&lt;1) is finely dispersed in the superconducting crystal of Bi.sub.2 Sr.sub.2 Ca.sub.1 Cu.sub.2 O.sub.y (wherein y is about 8). The precipitates act as flux pinning centers. Further, an oxide superconductor according to the present invention comprises superconducting crystal consisting of Bi, Sr, Ca and Cu oxides and separate oxide phases including Pt as a principal component being finely dispersed in the superconducting crystal. These finely dispersed oxides including Pt act as flux pinning centers.

Oxide superconductor and a method for manufacturing an oxide

An improved method for producing superconductive oxide substance, wherein a solution containing therein a plurality of elements to constitute the superconductive oxide substance is atomized into mists, then the thus atomized mists are transported on a carrier gas into a chemical reaction device, and, after the chemical reaction in this chemical reaction device, the superconductive oxide substance is deposited on a substrate in a desired shape, with further heat-treatment of the thus deposited superconductive oxide substance in an oxygen-containing atmosphere at a temperature ranging from 200.degree. C. to 1,200.degree. C. A method for producing superconductive oxide powder, wherein a solution containing therein a plurality of elements, which have been blended in a manner to exhibit the superconductive property by heat-treatment, is atomized into mists, then the atomized solution of the superconductive substance is heat-treated, and the resultant finely divided substance as heat-treated is separated and collected.

Plasma based method for production of superconductive oxide layers

Growing community of inventors

Amagasaki, Japan

Mitsunobu Wakata