Asahi Glass Company, Limited

Jun-ichi Shimoyama

Takeshi Morimoto

Toshiya Matsubara

Shinji Kondoh

Jun-ichiro Kase

An oxide superconductor having a structure such that a double oxide of at least one metal selected from the Group 2A elements and at least one metal selected from the Group 4A, Group 4B and rare earth elements, is dispersed in oxide superconductor crystals.

Oxide superconductor comprising BaBO.sub.3 dispersions (where B is Zr,

An oxide superconductor comprising a matrix of plate crystals of the formula REBa.sub.2 Cu.sub.3 O.sub.7-y wherein RE is at least one member selected from the group consisting of Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Lu, and y is the amount of oxygen deficiency, oriented and overlaid one on another, and granular crystals of the formula RE.sub.2 BACuO.sub.5 wherein RE is as defined above, insularly dispersed in the matrix in an amount of at least 0.1 mol per mol of the REBa.sub.2 Cu.sub.3 O.sub.7-y crystals.

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Yokohama, Japan

Jun-ichi Shimoyama