On the solid solution Sr(1.45–x)CaxSb0.55O3–y

Several compositions in the system Sr(1.45–x)CaxSb0.55O3–y (0 ⩽ x ⩽ 1.45) have been synthesized by solid state reaction in air at 1000°C and investigated by powder X-ray diffraction and EDS microanalysis. They exhibit good thermal stability up to 1200°C. The solid solution range was delimited in the composition 0 ⩽ x ⩽ 1.1. For quantities of Ca2+ higher than 1.1, the amount of solid solution decreases and another phase, Ca6Sb2O10, appears. The lattice parameters of the system Sr(1.45–x)CaxSb0.55O3–y decrease with increasing Ca2+ content.