Abstract
The high-temperature behavior of different polymorphs of the compounds Na3Ca2(SO4)3F, Na3Cd2(SO4)3Cl, and Na3Pb2(SO4)3Cl with the apatite structure has been studied for the first time by high-temperature X-ray diffraction and differential thermal analysis. The sodium cadmium chloride trisulfate has been shown to undergo a phase transition at 494 K, which involves a reduction in unit-cell symmetry from hexagonal to monoclinic. The sodium calcium chloride trisulfate undergoes a phase transition at 897 K, which involves a reduction in symmetry from hexagonal to orthorhombic and a breakup of the apatite structure. We have determined the linear and volume expansivities of the three compounds.
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Original Russian Text © A.V. Knyazev, E.N. Bulanov, V.Zh. Korokin, 2014, published in Neorganicheskie Materialy, 2014, Vol. 50, No. 5, pp. 559–567.
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Knyazev, A.V., Bulanov, E.N. & Korokin, V.Z. Synthesis and thermal expansion of M I3 M II2 (SO4)3L (L = Halogen) compounds with the apatite structure. Inorg Mater 50, 519–527 (2014). https://doi.org/10.1134/S0020168514050069
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DOI: https://doi.org/10.1134/S0020168514050069