Ag2O-Doped Bi2Sr2Ca1Cu2Ox Superconductors Prepared via Melt-Quenching |
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Authors: | Won-Hyuk Lee Yoshihiro Abe Eikichi Inukai |
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Affiliation: | Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466, Japan;Chubu Electric Power Co. Inc., Nagoya 459, Japan |
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Abstract: | Ag2O-doped superconducting Bi2Sr2Ca1Cu2O x ceramics were prepared by a melt-quenching–reheating method. It is found that the Ag2O-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 Ag2O-doped, as-cast specimens into superconducting ceramics when heated in an evacuated vessel is explained in terms of the oxygen donor of Ag2O in the specimen. This finding enables us to fabricate a desired shape of superconducting Bi2Sr2Ca1Cu2O x ceramics sealed in metals or glasses. The addition of Ag2O to Bi2Sr2Ca1Cu2O 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. |
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