The phase equilibria in the LaCoO3-LaMnO3-SrCoO2.5-SrMnO3 system were studi
ed at 1100 degrees C in air. The existence of SrCo1-yMnyO3-delta with the h
omogeneity range 0.45 less than or equal to y less than or equal to 0.55 wa
s confirmed. The homogeneity range of solid solutions of general formula La
1-xSrxCo1-yMnyO3+/-delta with orthorhombic, rhombohedral, and cubic structu
re has been determined. Based on the experimental results and earlier data,
the pseudoquaternary phase diagram was constructed. (C) 1999 Elsevier Scie
nce Ltd.