BiSrCaCuO High‐<i>T</i>_c Superconductors

Abstract

High‐ T c superconductivity in the Bi‐Sr‐Ca‐Cu Osystem was discovered six years ago. Since then the superconducting compounds have been indentified and their structures, crystal chemistry, phase equilibria, and properties investigated extensively. Recent results of studies of the crystal chemistry and phase equilibria of these challenging materials are presented and discussed. Possible areas for future work, where knowledge is lacking or measurements are contradictory, are pointed out.