A novel and rapid method to prepare 123 superconductor powder based on microwave processing is reported. A mixture of the nitrates of Y, Ba, and Cu in 123 stoichiometry when subjected to microwaves of frequency 2.45 GHz for 240 s resulted in an appreciable quantity of tetragonal 123 phase. Annealing for a period of 4 h at 940°C in flowing oxygen formed a superconductor having a T c of 91 K. Sintered pellets of the powder formed by microwave processing have shown transport J c of 105 A/cm 2 .
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Warrier et al. (1992) studied this question.
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