Preparation of the High-Quality Superconductor La1Ba2Cu3Oy |
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| Authors: | Takahiro Wada Nobuo Suzuki Hisao Yamauchi Shoji Tanaka Atsutaka Maeda Kunimitsu Uchinokura |
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| Affiliation: | Superconductivity Research Laboratory, International Superconductivity Technology Center, Koto-ku, Tokyo 135, Japan;Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan |
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| Abstract: | The relationship between the preparation procedure and superconducting properties of La1Ba2Cu3Oy was studied. A series of samples was sintered in an N2-gas atmosphere for various lengths of time ranging from 1 to 40 h, followed by a fixed annealing procedure in O2. It was found that the shorter the sintering period, the higher was the oxygen content. The samples sintered for a period of less than 15 h contained excess oxygen compared with La1Ba2Cu3O7 and exhibited poor superconducting properties. The sample sintered for 40 h had an oxygen content y equal to 6.95, and had excellent superconducting properties. The mechanism for preparing high-quality La1Ba2Cu3Oy is discussed. |
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| Keywords: | superconductors lanthanum barium processing sintering |
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