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Bulletin of Materials Science

, Volume 14, Issue 2, pp 415–422 | Cite as

Growth of high-temperature superconductor crystals from flux

  • L N Demianets
  • A B Bykov
  • O K Melnikov
  • S M Stishov
International Conference On Superconductivity—I

Abstract

Crystallization of high-temperature superconductors was studied in La-Sr-Cu-O, Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O systems. Platelet crystals YBa2Cu3O6.5+x were obtained by spontaneous crystallization from homogeneous nonstoichiometric melts enriched in barium and copper oxide. La2−x Sr x CuO4 was prepared by slow cooling of melts enriched in copper oxide. Bi2(Sr,Ca) n + 1Cu n O y , (n=1; 2) was obtained by melting zone travelling. The crystals show transition to superconducting state atT=93 K, ΔT 0.2–0.5 K (Y, Ba cuprate),T=87 K, ΔT 2K (Bi, Sr, Ca-cuprate). La, Sr-cuprate single crystals obtained by Czochralski method did not show transition to superconducting state. For flux-grown crystalsT c was 5–26 K depending on the composition, growth and heat treatment. The short characterization of some accessory phases (Ba3Y2Cu3PtO10, Ca1.75Sr1.5Cu0.75PtO6, BaCuO2, Ba41Cu44O84Cl2) is reported.

Keywords

Superconductivity single crystals La-Sr-Cu-O system Y-Ba-Cu-O system Bi-Sr-Ca-Cu-O system 

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Copyright information

© Indian Academy of Sciences 1991

Authors and Affiliations

  • L N Demianets
    • 1
  • A B Bykov
    • 1
  • O K Melnikov
    • 1
  • S M Stishov
    • 1
  1. 1.Institute of CrystallographyAcademy of Sciences of the USSRMoscowUSSR

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