SUPERCONDUCTING BEHAVIORS OF MELT-TEXTURED ND(1-XCU(3)O(Y) UNDERGOINGHEAT-TREATMENTS IN FLOWING ARGON AND OXYGEN(X)BA2)

Many studies showed that the preparation of melt textured Nd1+xBa2-xCu 3Oy must be carried out in flowing argon in order to obtain the high T -c phase [1,4]. We report that melt textured Nd1-xBa2-xCu3Oy can be ob tained through a conventional melt textured process and a following Ar treatment. The melt textured sample is superconducting at 63 K withou t any following heat treatments. Its critical temperature rises up to 78 K after oxygenation. The sample undergoes a orthorhombic-to-tetrago nal phase transition through a flowing Ar treatment. This structure ch ange seems to be useful to increase the critical temperature of the sa mple. A high critical transition temperature up to 93 K and an onset t emperature of 96 K can be obtained through the optimal treating proces s. Moreover, the oxygenation temperature of melt textured Nd1+xBa2-xCu 3Oy is lower than that of melt textured YBCO.