High-temperature superconductors YBa[Cu.sub.2][O.sub.5] and [Tl.sub.1.5]Ba[Ca.sub.2][Cu.sub.2.5][O.sub.8] with a decreased content of heavy metals

• Published in: Physics of the solid state Vol. 54; no. 3; pp. 459 - 461
• Main Authors: Gerbshtein, Yu.M, Nikulin, E.I
• Format: Journal Article
• Language: English
• Published: Springer 01-03-2012
• Subjects: Electric properties; Electrical conductivity; Heavy metals; High temperature superconductors
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783412030122

New high-temperature superconductors YBa[Cu.sub.2][O.sub.5] and [Tl.sub.1.5]Ba[Ca.sub.2][Cu.sub.2.5][O.sub.8] have been synthesized. They can be considered as a result of the removal of barium cuprate BaCu[O.sub.2] from Y[Ba.sub.2][Cu.sub.3][O.sub.7] and barium cuprate--tallate Ba[Cu.sub.0.5][Tl.sub.0.5][O.sub.2] from [Tl.sub.2][Ba.sub.2][Ca.sub.2][Cu.sub.3][O.sub.10]. The synthesized compounds contain a smaller amount of toxic Ba and Tl. Investigation of electrical conductivity has demonstrated that the values of [T.sub.c] of synthesized materials are close to [T.sub.c] of starting materials. The Meissner effect observed for these materials has confirmed their belonging to high-temperature superconductors.