Hitachi Chemical Company, Ltd.

Shuichiro Shimoda

Toranosuke Ashizawa

Keiji Sumiya

Shozo Yamana

Minoru Ishihara

Hideji Kuwajima

Hidegi Kuwajima

An oxide superconductor of the formula: Bi.sub.1.0 Sr.sub.A Ca.sub.B Mg.sub.C Ba.sub.D Cu.sub.1.0.+-.0.15 O.sub.X wherein A=0.6-1.3, B=0.3-0.9, C=0.01-0.3 and D=0.01-0.3 in atomic ratio, having a 2212 phase with a critical temperature of making electrical resistance zero at about 80K or more, can be produced by firing preferably at 820.degree.-870.degree. C. in a lower oxygen content atmosphere.

Oxide superconductor Bi--Sr--Ca--Mg--Ba--Cu--O

The present invention provides an oxide superconductor which is mainly composed of bismuth, lead, strontium, calcium, magnesium, and copper and has the composition represented by the formula:

Bi-Pb-Sr-Mg-Ba-Ca-Cu-O oxide superconductors and production thereof

A superconducting thick film circuit board or thick film superconductor obtained by forming a rod-like crystal superconducting composite layer comprising a superconductor made of a compound of M-Ba-Cu-O, M being Y and/or a lanthanide element, and a composite of Ag and Pt on a stabilized zirconia substrate has a high Jc value and good superconducting properties.

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Katsuta, Japan

Shuichiro Shimoda