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The solid solutions Na3(1−x)Alx2xPO4: room temperature powder neutron diffraction studies of the two compositions x=0.025 and x=0.2
Authors:John M. Newsam   Anthony K. Cheetham  Bruce C. Tofield
Abstract:The crystal structures of the high-temperature modifications of sodium and silver orthophosphates have been determined using powder neutron diffraction (PND) data. II-Na3PO4 adopts the space group Fm3m with at 400°C. The PO3−4 group is centered around the origin, but it shows high orientational disorder. The sodium ions occupy the and sites. II-Ag3PO4, at 650°C, is similar with . The structure of I-Ag3PO4 at room temperature
has been re-examined by single-crystal X-ray diffraction. The derived model, with R=0.019 for 116 independent reflections, is in agreement with the latest work reported in the literature. The structure of I-Ag3PO4 at 375°C, as determined by PND, has , and displays no gross modifications from that observed at 25°C, although the anisotropic nature of the silver sites is markedly more pronounced at this higher temperature. The cation mobility is discussed in relation to the high-temperatures structures.
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