Bi-Pb-Sr-Ca-Cu-O超导陶瓷的烧结反应与临界电流密度

来源期刊：中南大学学报(自然科学版)1991年第6期

论文作者：陈康华 黄培云 吕海波 周桂芝 李晋尧

文章页码：83 - 88

关键词：铋铅锶钙铜氧; 临界电流密度; 烧结; 高温X射线衍射; 超导

Key words：Bi-Pb-Sr-Ca-Cu-O; critical current density; sintering; high temperature X-ray diffraction; superconducting

摘    要：用高温X射线衍射、SEM-EDX分析、差热分析和目测法确定了Bi-Pb-Sr-Ca-Cu-O超导陶瓷烧结过程中的中间产物的熔融反应,并考察了这种反应对超导陶瓷显微组织和临界电流密度(J_c)的影响。上述综合研究表明,中间产物[30A相与(Sr_1-xCa_x)₂PbO₄相]的熔融反应产生(Sr_1-xCa_x)₂CuO₃相粗粒,形成成分偏析的显微组织,这是高温反应烧结导致低J_c超导陶瓷的原因。

Abstract: The critical current densities and the microstructures of superconducting Bi-Pb-Sr-Ca-Cu-O ceramics sintered at various temperatures were measured and characterized, and the melting of transient phases in the reactive sintering of super-conducting Bi-Pb-Sr-Ca-Cu-O ceramics was investigated by high temperature X-ray diffraction, SEM-EDX analysis, DTA and direct observation of melting. The melting of transient phases [30A phase and (Sr_1-x Ca_x)₂PbO₄] results in the formation of large (Sr_1-xCa_x)₂CuO₃ particles and inhomogeneous distribution of components. The low critical current density of the superconducting ceramics sintered at higher temperature results from the melting of transient phases.