Abstract
The (Bi/sub 0.7/Pb/sub 0.3/)/sub 1-y/Sr/sub 1/Ca/sub 1/Cu/sub 1.8/ superconductor sintered above 855 degrees C is shown to have a microstructure consisting of superconducting platelike grains embedded in a matrix formed by semiconducting rodlike grains due to the melting of Bi/sub 2/O/sub 3/, whereas it has a microstructure consisting of a small number of semiconducting rodlike grains embedded in the superconducting matrix when it is sintered at 845 degrees C. The amount of high-T/sub c/ phase increases and that of low T/sub c/ phase decreases as the sintering period increases, making it possible to fabricate superconductors with T/sub c/ above 100 K by sintering at 845 degrees C in air for 240 h. The sintering time can be shortened by sintering first below 850 degrees C to obtain a microstructure consisting of the platelike grain matrix and resintering at higher temperature to enhance the growth of the high-T/sub c/ phase. Superconductors with a T/sub c/ of 106 K have been fabricated by sintering at 845 degrees C for 48 h followed by sintering at 855 degrees C for 24 h.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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