Abstract
Abstract Temperature dependence of the monoclinic superstructure reflections in lead orthophosphate Pb3(PO4)2 has been studied by X-ray diffraction of single crystals. Above Tc = 180°C, temperature of the first-order ferroeleastic phase transition C2/c-R3m, superstructure reflections are still observed but their position is shifted from the commensurate value. However, particular symmetry properties in the diffraction pattern: violation of the ±q symmetry and of the translational symmetry, preclude any description by a classical modulated wave vector. Similar anomalies have been reported in the so-called premartensitic phases of some metallic alloys. It is shown that the microscopic model, developed by Yamada et al. (1985) for a metallic alloy, can be applied to Pb3(PO4)2 in order to explain the particular diffraction pattern observed above 180°C.
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