Relationship between Crystal Structures and Solid Solution of Tl-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O Superconductors

1 July 1989

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 28 (7A) , L1186
https://doi.org/10.1143/jjap.28.l1186

Abstract

We report on the superconductivity and crystal structures in Tl-(Ba, Sr)-Ca-Cu-O (TBSCC) system. In the case of TBSCC system, the 2223 phase was obtained as a single phase more easily compared with the Tl-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O systems. As a result, we achieved a high superconducting volume fraction, 95% above 100 K. The crystallographic transformation was caused by changing the ratio of Ba to Sr. By the X-ray diffraction and TEM analysis, the crystal structure was determined as a 2223 structure consisting of Tl-O bilayers in the Ba-rich side, and a 1223 structure consisting of Tl-O monolayer in the Sr-rich side.

Keywords

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