| 摘要 |
PURPOSE:To produce the title dense oxide superconducting sintered body having superior orientation characteristic of crystals by molding a powder mixture consisting of oxide superconducting powder having plate structure and oxide superconducting powder having granular structure, and sintering the mixture. CONSTITUTION:A mixture contg. a larger amt. of Cu than a chemical soichiometric ratio (0.1-10mole per 1mole Ln) among each element constituting a perovskite type oxide superconductor expressed by the formula (wherein Ln is at least one kind of rare earth elements; delta is a number of deficient oxygen atom), is heated at a temp. higher than the m.p. of the superconductor and melted, and then crystallized by cooling and pulverized. Thus, oxide superconducting powder (A) having a plate structure having iota5 ratio of particle size in the direction of C face to the thickness of particles in the C axis direction is obtd. Then, a mixture of each starting material consisting of 60-95vol.% (A) and 40-5vol.% granular oxide superconducting powder (B) obtd. by precalcining each starting material of the formula at 800-980 deg.C and pulverizing after crystallization, is molded and sintered at 900-1040 deg.C in O2-contg. atmosphere, then, annealed at 300-700 deg.C. |
