急冷及び熱処理により作製した高温超伝導酸化物Y-Ba-Cu-O-Fの粉末X線解析

概要

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Effects of quenching and annealing on the crystal structure of single phase superconducting oxide ceramics, Y_1Ba_2Cu_3O_<7-x>F_y(y = 0.4), were studied by X-ray powder diffraction analysis. X-ray analysis revealed that the orthorhombic phase of Y_1Ba_2Cu_3O_<7-x>F_y was formed by thermal quenching from 900℃ to room temperature, in contrast to Y_1Ba_2Cu_3O_<7-x> in which the tetragonal phase was frozen by such quenching. The lattice-parameter ratio b/a (a<b) in the orthorhombic phase, which showed superconductivity at low temperature, increased on fluorine doping into Y_1Ba_2Cu_3O_<7-x>.
社団法人日本セラミックス協会の論文
1988-08-01