| 摘要 |
PURPOSE:To provide the title superconductor having the critical temperature higher than the boiling point of liquid nitrogen and manifesting superconductivity at ca. 100K, having a specific composition made up of Tl or Pb or Bi, one or two group IIa element(s) except Be and Ra, Cu and O. CONSTITUTION:The objective superconductor represented by the generic formula: AxByCuzOdelta; where A is an element selected from Tl, Pb and Bi, B is one or two element(s) selected from group IIa elements (except Be and Ra), x and y are each real number >0 but <=5, z is real number >=2 but <=4, delta is real number >=1 but <=10. This superconductor is e.g. of the formula Bi3(Ca, Sr)2Cu2 O4.2, Pb2(Ba, Ca)Cu3O6.5, Tl3Ba2Cu2O4, giving zero electrical resistance and having Meissner effect at temperatures at or higher than the boiling point (77K) of liquid nitrogen or near 100K (100 to 120K) and also is a stable substance. |
