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Ag 2 O‐Doped Bi 2 Sr 2 Ca 1 Cu 2 O x Superconductors Prepared via Melt‐Quenching
Author(s) -
Lee WonHyuk,
Abe Yoshihiro,
Inukai Eikichi
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb05305.x
Subject(s) - superconductivity , materials science , doping , ceramic , quenching (fluorescence) , analytical chemistry (journal) , high temperature superconductivity , mineralogy , metallurgy , chemistry , condensed matter physics , physics , optoelectronics , quantum mechanics , fluorescence , chromatography
Ag 2 O‐doped superconducting Bi 2 Sr 2 Ca 1 Cu 2 O x ceramics were prepared by a melt‐quenching–reheating method. It is found that the Ag 2 O‐doped, as‐cast specimens exhibit superconductivity ( T c = around 80 K) by heat treatment at temperatures around 800°C even in an evacuated and sealed silica glass tube, while the undoped specimens do not and vaporize by the corresponding heat treatment. Conversion of the Ag 2 O‐doped, as‐cast specimens into superconducting ceramics when heated in an evacuated vessel is explained in terms of the oxygen donor of Ag 2 O in the specimen. This finding enables us to fabricate a desired shape of superconducting Bi 2 Sr 2 Ca 1 Cu 2 O x ceramics sealed in metals or glasses. The addition of Ag 2 O to Bi 2 Sr 2 Ca 1 Cu 2 O x melt, however, had deleterious influences on the superconducting properties ( T c and J c ) of the resultant ceramics when obtained by heat treatment in air.