溶融法による高Jc酸化物超伝導体の合成と臨界電流特性
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概要
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YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>x</SUB> powders were rapidly heated to the Y<SUB>2</SUB>O<SUB>3</SUB> plus liquid region and quenched using copper hammers. The quenched plates were again heated to the Y<SUB>2</SUB>BaCuO<SUB>5</SUB> plus liquid region and slow cooled in a thermal gradient. The process enabled uni-directional growth of the superconducting phase. Magnetization measurements revealed that magnetic properties of the melt processed samples could be understood in terms of Bean critical state model. The samples attained Jc values exceeding 10<SUP>4</SUP> A/cm<SUP>2</SUP> at 77K and 1T. Ginat flux creep was not observed in such samples.
- 社団法人 粉体粉末冶金協会の論文