超导相(Bi_(1.7)Pb_(0.2)In_(0.1))Sr_2Ca_2Cu_3O_(10)的制备和晶体结构研究

PREPARATIVE AND STRUCTURAL STUDIES ON THE SUPERCONDUCTING PHASE (Bi_(1.7)Pb_(0.2)In_(0.1)) Sr_2Ca_2Cu_3O_(10)

Bi-Sr-Ca-Cu-O体系的掺杂可以改善超导性能和消除堆垛层错。由于铋氧双层的作用还未能很好地了解,我们合成X_2Sr_2Ca_2Cu_3O_(10)的纯相,[X为(Bi_(0.85)Ph_(0.1)In_(0.05)]以确定其是(XOXO)还是(XO_2X),以及如何影响晶体结构,超导性质和生成机理。合成和鉴定CaCO_3、SrO、CuO的混合物于900℃烧结20hr得到Sr_2Ca_2Cu_3O_7,然后与Bi_2O_3、PbO按摩尔比1∶0.87∶0.3混匀,压片,于870℃加热20hr,重新研磨,在880℃加热30hr,再加0.6%mol In_2O_3,于890℃烧结20hr,然后在空气中淬火,样品表面部分微熔。

The superconducting phase(Bi_(1.7)Pb_(0.2)In_(0.1))Sr_2Ca_2Cu_3O_(10) with on-set T_c near 112K and zero resistivity at 95K has been prepared. The Unit cell is. body-centered tetragonal, space group I4/mmm, a=3. 817(1)A, c=37.04(1)A. Chemical substitution of Pb and In in Bi-Sr-Ca-Cu-O series results in the growth of 2223 phase. The superconductivity and the formation mechanism are associated with the structural features.