Process for producing a compound oxide type superconducting material
AssigneeSumitomo Electric Industries, Ltd.
InventorsNobuhiko Fujita, Hideo Itozaki, Saburo Tanaka, Shuji Yazu, Tetsuji Jodai
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Abstract
The invention is an after-treatment of a compound oxide type superconducting material by oxygen plasma to improve the superconducting property of the material. The treatment by oxygen plasma is performed while the material is heated at 500.degree. to 1,000.degree. C. The material may have a form of bulky mass or a form of a thin film deposited on a substrate by physical vapor deposition technique.
Claims14
Improvement in a process for producing a compound oxide type superconducting material, characterized in that the compound oxide type superconducting material is treated in oxygen plasma while the compound oxide type superconducting material is heated at a temperature ranging from 500.degree. to 1000.degree. C.
Process for producing a compound oxide type superconducting material by selecting a compound oxide from a group consisting of (i) compound oxides containing an element .alpha. selected from IIa group of the periodic table, an element .beta. selected from IIIb group of the periodic table and copper (Cu) and (ii) compound oxides have the general formula:
- .THETA.4(.PHI..sub.1-q,Ca.sub.q).sub.m Cu.sub.n O.sub.p-r
- in which .THETA. is bi or Tl, .PHI. is Sr when .THETA. is Bi and is Ba when .THETA. is Tl, m and n are numbers each satisfying respective ranges of 6.ltoreq.m.ltoreq.10 and 4.ltoreq.n.ltoreq.8, p=(12+2m+2n)/2, q is a number which satisfies a range of 0<q<1 and r is a number which satisfies a range of -2.ltoreq.r.ltoreq.+2, and preparing the compound oxide type superconducting material which was selected in a form of a thin film or a bulk form and treated in oxygen plasma while the compound oxide type superconducting material is heated at a temperature ranging from 500.degree. to 1000.degree. C.
Dependencies are inferred from the claim text.