Novel structural features and phase transition behaviour of (Sr_1-xCa_x)TiO₃: II. X-ray diffraction studies

Results of a careful XRD study of the room temperature structure of (Sr_1-xCa_x)TiO₃ (SCT) with are presented to show that the structure of SCT is CaTiO_3- (CT-) like for . High temperature XRD studies on the phase transition behaviour of SCT with show the existence of an intermediate phase in between the room temperature orthorhombic phase and the high temperature cubic phase. This is analogous to the phase transition behaviour of pure CT and is attributed to the softening of the R₂₅ and M₃ point phonon modes.