| 摘要 |
PURPOSE:To obtain the subject superconductor being fine, having no pores and further having a homogeneous composition by making the first layer with a complex oxide consisting of component elements in a Tl series oxide superconductor except Tl and making the second layer with Tl oxide or a complex oxide of Tl and other elements included in a Tl series oxide superconductor. CONSTITUTION:As a Tl series oxide superconductor, 2233 phase especially having Tl2Ba2Ca2Cu3O10+x composition and ca. 120K Tc is preferable. In the above Tl series superconductor, a layer consisting of an oxide of the component element except Tl, e.g. a layer consisting of Ba-Ca-Cu-O elements, is made for the first layer on which is coated the second layer consisting of an oxide of Tl or Tl and other elements, e.g. an oxide consisting of Tl-Ba-O, Tl-Cu-O or Tl-Ba-Cu-O elements, and the whole is subjected to diffusion heat treatment at 780-880 deg.C to obtain the Tl series oxide superconductor. Here, the heat treatment temperature can be lowered when Ag is added in the second layer. |
