Phase diagram of the Bi–Sr–Cu–O system

Abstract

The phases present in the Bi–Sr–Cu–O system in air, at 865 °C, have been investigated using X-ray diffraction techniques, with particular emphasis on the homogeneity ranges of the ternary oxide phases. Only three such phases were found; a tetragonal form and an orthorhombic form of Bi₂Sr₂CuO₆(both exhibiting homogeneity ranges), and Bi₄Sr₈Cu₅O_z. Eight binary oxides were also found. No evidence was found at this temperature for the previously reported phases, Bi₂Sr₃Cu₂O_z and Bi₁₇Sr₁₆Cu₇O_y.