Superlattice reflections observed for the first time in the room temperature powder neutron diffraction patterns of SCT are shown to arise due to tilting of TiO 6 octahedra. Rietveld refinement of the neutron diffraction data confirms that the structure of SCT for is orthorhombic similar to that of CaTiO 3 . Implications of the presence of tilted TiO 6 octahedra and the associated off-centre displacements of Sr 3+ /Ca 2+ in SCT are discussed in detail with regard to the quantum ferroelectric behaviour of SCT at low temperatures. Structural phase transitions in SCT with x = 0.06 and 0.12 are also reported.
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Ranjan et al. (1999) studied this question.
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