【摘要】 <正> 一、引言 自液氮温区Y-Ba-Cu-O系统超导体发现以来,从物理学及结晶学角度研究YBa₂Cu₃O_7-b（123化合物）及其它相的晶体结构和超导性能等方面有大量的报道。本文从陶瓷工艺角度系统地研究预烧温度Τ_pi及烧成温度Τ_i对显微结构和抗磁性能的影响。更多还原

【Abstract】 The influence of prefiring and firing temperatures(T_pt and T_t)on the microstructure and diamagnetism of YBa₂Cu₃O_7-δceramics was studied. It has been found that under a specified prefiring and firing processes, there exists a T_t and T_pt range, respectively,in which the bulk density and the amount of superconducting phase are maximized. The total diamagnetic shift value can be affected by the following factors: the amount of superconductive phase per unit volume, the size and integrity of superconductive grains, and the diamagnetic shielding effect of grains upon pores and second phases.更多还原