Asahi Glass Company, Limited

Jun-ichiro Kase

Takeshi Morimoto

Yasumasa Nakao

Toshiya Matsubara

Yasuji Fukasawa

Jun-ichi Shimoyama

A glass substrate for a display with a thickness of from 0.3 to 6 mm, which has an average W (filtered center line waviness: JIS B0651) of from 0.03 to 0.5 &mgr;m measured with a contact-type surface roughness measuring instrument using a phase compensation 2RC zone filter with a cutoff value of 0.8 to 25 mm over a measuring length of 200 mm.

Glass substrate for display and method of selecting it

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-ichiro Kase