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
1988 年 96 巻 1116 号 p. 810-813
詳細
1988 年 96 巻 1116 号 p. 810-813
Effects of quenching and annealing on the crystal structure of single phase superconducting oxide ceramics, Y1Ba2Cu3O7-xFy (y=0.4), were studied by X-ray powder diffraction analysis. X-ray analysis revealed that the orthorhombic phase of Y1Ba2Cu3O7-xFy was formed by thermal quenching from 900°C to room temperature, in contrast to Y1Ba2Cu3O7-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 Y1Ba2Cu3O7-x.
