融液冷却法における酸化物高温超伝導体Ba-Y-Cu-Oの生成機構

概要

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The formation mechanism of superconducting Ba_2YCu_3O_<7-δ> crystals in the melt quenching method and the superconducting properties of the annealed samples were examined. The following results were obtained. Ba_2YCu_3O_<7-δ> crystals were formed by annealing the melt quenching samples at around 750℃ in the air. It was necessary to supply oxygen for the formation of B_2YCu_3O_<7-δ> crystals. The bulk density of the samples annealed at around 900℃ was 5.7 g/cm^3 and the pores which were regarded to be the path of oxygen were observed. The critical temperature T_<c,zero> of superconducting Ba-Y-Cu-O oxides ranged from 85 K to 93 K. The critical current density at 77 K in the zero magnetic field for the sample annealed at 950℃ for 24 h in oxygen atmosphere was 35 A/cm^2.
社団法人日本セラミックス協会の論文
1988-04-01