| 摘要 |
PURPOSE:To obtain a superconducting material having a stable, high critical temperature by blending each simple substance or compound powder of Tl, Ba and Cu in a given ratio, calcining, then grinding to give raw material powder and sintering. CONSTITUTION:Powder of each simple substance of Tl, Ba and Cu or powder of compounds, oxides or precursors (e.g. carbonate) thereof is collected in a given ratio and blended. Then the blend powder is calcined at >=750 deg.C for 1-50hr to give a calcined material, which is ground by a ball mill, etc. to give calcined powder having <=10mu particle size. The powder is used as raw material powder, optionally molded, sintered at >=750 deg.C for 1-50hr and optionally these operations are repeated to give a superconductor, a compound oxide having a composition shown by the formula TlxBaCuzOa (0.5<=x<=3.0; 0.9<=z<=4.0). |
