Synthesis and Properties of Powdered Oxide Superconductor by the Mist Pyrolysis Method

[摘要] References(22)Cited-By(1)Y-Ba-Cu-O and Bi-Pb-Sr-Ca-Cu-O superconductor powders were synthesized by the mist pyrolysis method. The crystalline phase and morphology of mist-pyrolyzed powders depended on the heating temperature, heating time, and concentration of starting solutions. Superconducting phase of Y-Ba-Cu-O and Bi-Pb-Sr-Ca-Cu-O superconductor (low-Tc phase) were obtained directly by this method. Sintered body of Y-Ba-Cu-O superconductor obtained by using mist-pyrolyzed powder had a density of above 95% of the theoretical density. The critical temperature (Tc) of Y-Ba-Cu-O superconductor (Tc end point) was 90 K and its critical current density (Jc) was above 230 A/cm2 (at 77 K). The Tc value of sintered Bi-Pb-Sr-Ca-Cu-O body was increased from 55 K to 103 K, because the low-Tc phase was converted to high-Tc phase by the long heat treatment. The optimum Jc value of Bi-Pb-Sr-Ca-Cu-O sintered body was 172 A/cm2 (at 77 K).

[关键词] Aerosol;Oxide Superconductor;Pyrolysis;Particle;Sintering;Superconductivity