PURPOSE: To sufficiently remove unnecessary elements in presintering and to obtain the title high-density and high-strength superconductor having excellent critical current density by carrying out calcination at the time of calcining a mixed powder contg. specified amts. of raw compds., presintering, and then sintering the calcined product to produce the superconductor.
CONSTITUTION: The specified amts. of the compds. contg. the respective elements constituting the oxide superconductor expressed by A-B-C-D are weighed, and mixed to obtain the mixed powder as the starting material (A is rare-earth elements including Y and Sc, B is Sr, Ba, Ca, Be, Mg, and Ra, C is Cu or ≥2 kinds including Cu among Cu, Ag, Au, and Nb, and D is ≥1 kind contg. O among F, Cl, etc., and O). The mixed powder is calcined at 800W910°C to sufficiently remove unnecessary elements and presintered, then the calcined product is crushed, if necessary, sized, mixed, and formed, and the formed product is sintered at 800W950°C for 6W50hr in an O2-contg. atmosphere.
KONO TSUKASA
IKENO YOSHIMITSU
SADAKATA NOBUYUKI
AOKI SHINYA
SUGIMOTO MASARU
NAKAGAWA MIKIO
KUME ATSUSHI
GOTO KENJI
YAMAGUCHI TAICHI
IIJIMA KOSUKE
