摘要
The important progress of the superconductivity in R-Ba(Sr)-Cu-O system (R=La, Y)made by Zhao Zhongxian, Bednorz and Cava et al. has interested the science and technology circles greatly. In order to understand the mechanism of superconductivity in the system, it is important to determine the phases and structures existing in the system, and to pick up superconductive phases. The structures of some compounds in the system were re-
