| 摘要 |
PURPOSE:To increase critical current density in an intense magnetic field by laminating an oxide superconducting film contg. granular crystals of a specified multiple oxide insularly dispersed in crystals contg. Tl, Ba, Ca, Cu and O on a metal. CONSTITUTION:Starting materials for a superconductor contg. Tl, Ba, Ca, Cu and O are mixed with 0.5-20wt.% multiple oxide of one or more kinds of metals selected among group IIA elements and one or more kinds of metals selected among groups IVA and IVB elements and rare earth elements. The resulting mixture is heated to the partial melting temp. of the superconducting phase or above and solidified by cooling to obtain an oxide superconductor having a structure contg. granular crystals of the above-mentioned multiple oxide insularly dispersed in crystals contg. Tl, Ba, Ca, Cu and O. This superconductor is pulverized and spread on a metallic sheet to form a film and this film is melted and solidified. |
