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VOLUME 50 (1989) | ISSUE 1 | PAGE 40
The structure of superconducting TlBa2 (Ca0.87T0.13)Cu2O7 single crystals with T_c 80 ë
The crystal structure of the single crystals of the 1212 phase has been determined in theTl-Ba-Ca-Cu-O system; a = 3.8472(5), Ó = 12.721 (3) A, and space group PA/mmm. The chemical formula of this phase has been determined more accurately: TlBa2(Ca0.87 ô10ìú )Cu207, Tc ~ 80 K, the Meissner effect is 75-80%.