Abstract
The NaFeZr(PO4)2SO4 and Pb2/3FeZr(PO4)7/3(SO4)2/3 sulfate phosphates with the NaZr2(PO4)3 (NZP) structure were synthesized and studied using X-ray diffraction, electron microprobe analysis, IR spectroscopy, and simultaneous differential thermal and thermogravimetric analysis. The phase formation and thermal stability of the compounds were studied by powder X-ray diffraction and DTA–TG. The Pb2/3FeZr(PO4)7/3(SO4)2/3 structure was refined by full-profile analysis. The structure framework is composed of randomly occupied (Fe,Zr)O6 octahedra and (P,S)O4 tetrahedra; the Pb2+ ions occupy extra-framework sites. The thermal expansion of Pb2/3FeZr(PO4)7/3(SO4)2/3 in the temperature range from–120 to 200°C was studied by temperature X-ray diffraction. In terms of the average linear coefficient of thermal expansion (αav = 1.7 × 10–6°C–1), this compound can be classified as having low expansion. The combination of different tetrahedral anions (a phosphorus and a smaller sulfur one) in the NZP resulted in a decrease in the framework size and cavities and enabled the preparation of low-expansion sulfate phosphate with a smaller extra-framework cation (cheap Pb) instead of larger cations (Cs, Ba, Sr) used most often in the monoanionic phosphates.
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Original Russian Text © V.I. Pet’kov, A.S. Dmitrienko, M.V. Sukhanov, A.M. Koval’skii, E.Yu. Borovikova, 2016, published in Zhurnal Neorganicheskoi Khimii, 2016, Vol. 61, No. 5, pp. 654–660.
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Pet’kov, V.I., Dmitrienko, A.S., Sukhanov, M.V. et al. Synthesis, phase formation, and thermal expansion of sulfate phosphates with the NaZr2(PO4)3 structure. Russ. J. Inorg. Chem. 61, 623–629 (2016). https://doi.org/10.1134/S0036023616050168
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DOI: https://doi.org/10.1134/S0036023616050168