Superconductive copper-containing oxide materials of the formula A.sub.p B.sub.q Cu.sub.2 O.sub.4.+-.r

US5446017A · kind A · utility

Assignees

• CENTRAL RESEARCH INSTITUTE OF ELECTRIC POWER INDUSTRY · JP
• TOHOKU ELECTRIC POWER COMPANY, INC. · JP
• International Superconductivity Technology Center · JP

Inventors

• Takeshi Sakurai
• Nobuyuki Sugii · Tokyo, JP
• Seiji Adachi · Tokyo, JP
• Michiharu Ichikawa · Ebeye, US
• Yuji Yaegashi · Tokyo, JP
• Hisao Yamauchi · Nagareyama, JP
• Masahiko Shimada · Wako, JP
• Hirotsugu TAKIZAWA · Sendai, JP

Key dates

• Filing date: Apr 12, 1993
• Grant date: Aug 29, 1995
• Expiry date: Apr 12, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S505/776

Abstract

A superconductive oxide material having an infinite layer structure and having the following formula: EQU A.sub.p B.sub.q Cu.sub.2 O.sub.4.+-.r wherein A and B are different and each represent an element selected from lanthanoid elements and elements belonging to Groups IA, IIA and IIIA of the Periodic Table, p is between 0.9 and 1.1, q is between 0.9 and 1.1 and r is between 0 and 0.6. The oxide material has a crystal structure belonging to a tetragonal system of P4/mmm and 1-123 having the following lattice parameters: EQU 3.8.ANG..ltoreq.a.ltoreq.4.0.ANG. EQU 7.6.ANG..ltoreq.c.ltoreq.8.0.ANG. or to an orthorhombic system of Pmmm and I-47 having the following lattice parmeters: EQU 3.8.ANG..ltoreq.a.ltoreq.3.95.ANG. EQU 3.82.ANG..ltoreq.b.ltoreq.4.0.ANG. EQU 7.6.ANG..ltoreq.c.ltoreq.8.0.ANG..