| 摘要 |
PURPOSE:To obtain the title composition having high relative density, critical current density, and critical temp. and capable of being sintered at low temp. by substituting a part of the Ba in a rare-earth element-Ba-Cu-O oxide based superconductor for a prescribed amt. of Pb. CONSTITUTION:The raw materials consisting of a rare-earth element selected from Y2O3, Y2(C2O4)3, Y2(CO3)3, etc., a Ba compd. selected from BaO, BaCO3, BaO2, BaC2O4, etc., a Cu compd. selected from CuO, Cu(OH)2, basic copper carbonate, etc., and a Pb compd. selected from PbO, Pb3O4, PbO2, basic lead carbonate, etc., are collected, and mixed in the ratio corresponding to the desired composition. The mixed powder is then calcined at 700-1000 deg.C, dry-crushed or crushed with the use of a nonaqueous dispersion medium, granulated, then pressed or drawn by packing the powder in a metallic tube, and sintered in the atmosphere or oxygen to obtain the title composition expressed by the formula (R is a rare-earth element, 0<y<1, and 0.02<=x<=1.6). |
