共沈法により作製したYBCO超伝導セラミックスの特性

概要

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YBCO superconducting ceramics prepared by the coprecipitation method, have been studied. It was found that the particle size of the ceramics is less than 0.5 μm, and that a bulk density of more than 5.9 g/cm^3 is obtained by calcining at 850℃ for 9 h, followed by sintering at 920℃ for 3 h in _2. The critical current density (J_c) , measured by the standard four-probe resistive method was 200 A/cm^3. This experimental value was comparable with the calculated J_c. value from the magnetization curve using the critical state model. The result suggests that J_c is limited by the ratio of low supercouducting phase and the weak flux pinning force in the ceramics, prepared by the coprecipitation method. These properties were compared with those ceramics prepared by the solid state reaction method, and has a particle size of more than 5 μm.
社団法人日本セラミックス協会の論文
1988-04-01