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In order to obtain high-T c superconducting Ba-Y-Cu-O materials, we have studied a method used to supply the oxygen content using a thermodynamic nonequilibrium high-temperature (TNH) plasma. Compared with the usual glow discharge, very-high-density atomic oxygen was observed in the TNH plasma. Treatment of the TNH plasma showed the recovery of quenched samples from the tetragonal structure to an orthorhombic 90-K superconductor within 30 min at 300°C. This is superior to usual oxidation techniques of an atmospheric oxygen anneal and a glow discharge plasma from the viewpoint of short period and low temperature.
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Takagi et al. (1989) studied this question.
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