Metallic oxide with boron and process for manufacturing the same

Abstract

A novel metallic oxide of a Ln-Ca-Sr-Ba-Cu-B-O type and a process for manufacturing such a metallic oxide. The above metallic oxide has a composition expressed by the following formula (I): (Ln.sub.1-a Ca.sub.a)(Sr.sub.2-b Ba.sub.b)(Cu.sub.3-c B.sub.c)O.sub.d(I) wherein Ln is one or more kinds of elements selected from the group consisting of Y and lanthanoid elements except for Ce and Tb and wherein the following conditions are met: 0.1.ltoreq.a.ltoreq.0.5, 0.7.ltoreq.b.ltoreq.1.7, 0.1.ltoreq.c.ltoreq.0.5, and 6.5.ltoreq.d.ltoreq.7.5. A process for manufacturing the metallic oxide has the following steps. A mixture of materials including H.sub.3 BO.sub.3 used as a starting material of B is prepared. The resultant mixture is heated at a rate of 5.degree. C. or lower per minute up to 900.degree. C. or lower. Then, it is heated in an oxygen atmosphere at a range from 900.degree.-1050.degree. C.

Dependencies are inferred from the claim text.