| 摘要 |
PURPOSE:To simply improve properties at high temp. and resistance to moisture and an oxygen atmosphere at a low cost by blending Bi or Sb with two or more among Ba, Sr, Ca and Mg so as to obtain a prescribed compsn. ratio. CONSTITUTION:Bi2O3, SrCO3, CaCO3, CuO, etc., are mixed and press-compacted. This compact is calcined to obtain a molecular compd. represented by the formula (where x=0.3-1, y=2.0-4.0, preferably 2.5-3.5, z=1-2, w=8.0-12.0, preferably 10-11, A is Bi or Sb, B is B1-n and two or more among Ba, Sr, Ca and Mg). The compd. is pulverized, press-compacted again and sintered to produce superconducting ceramics having 137K critical temp. Tc. |
