| 摘要 |
PURPOSE:To produce the title superconductor which generates a high critical current density and having high superconductivity down to its inside part by specifying a relative density and an average crystal size thereof. CONSTITUTION:The title high density oxide superconductor has >=97% relative density and >=10mu average crystal size. The superconductor is prepd. by molding materials for the oxide superconductor having <=10mu average particle size and consisting primarily of lanthanoid elements(except Ce, Pr, Pm, and Tb), Y, Ba, and Cu, calcining the molded product at a temp. corresponding to < (A) 75-85%, and (B) 85-96% of a final calcination temp. in a temp. region >=30 deg.C temp. difference between (A) and (B). The calcined product is then calcined thereafter finally, which is then cooled to 700 deg.C in O2 atmosphere, and cooled further gradually to 300 deg.C in O2 atmosphere. |
