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Structure and thermal decomposition of Cs2HPO4 · 2H2O

  • Synthesis and Properties of Inorganic Compounds
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Abstract

The thermal transformations of disubstituted cesium orthophosphate crystal hydrate under heating in air up to 400°C have been studied. The dehydration process occurs in two stages with the loss of 0.6 water molecules at 60‒100°C and 1.4 water molecules at 100‒160°C. Anhydrous Cs2HPO4 is stable up to 300°C and is completely converted into cesium pyrophosphate Cs4P2O7 at 330°C. The structure of Cs2HPO4 · 2H2O has been determined. The compound crystallizes in monoclinic space group P21/c and has the unit cell parameters a = 7.4761(5) Å, b = 14.2125(8) Å, c = 7.9603(6) Å, β = 116.914(5)°, V = 754.20(9) Å3, and Z = 4 at‒123°C. An earlier unknown polymorph of Cs4P2O7 has been found. According to X-ray powder diffraction data, hexagonal space group Р63 has been proposed for the formed pyrophosphate.

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Authors and Affiliations

  1. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128, Russia

    G. V. Lavrova, N. V. Bulina, V. S. Min’kov & A. A. Matvienko

  2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia

    V. S. Min’kov & A. A. Matvienko

Authors
  1. G. V. Lavrova
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  2. N. V. Bulina
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  3. V. S. Min’kov
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  4. A. A. Matvienko
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Correspondence to G. V. Lavrova.

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Original Russian Text © G.V. Lavrova, N.V. Bulina, V.S. Min’kov, A.A. Matvienko, 2016, published in Zhurnal Neorganicheskoi Khimii, 2016, Vol. 61, No. 3, pp. 300-306.

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Lavrova, G.V., Bulina, N.V., Min’kov, V.S. et al. Structure and thermal decomposition of Cs2HPO4 · 2H2O. Russ. J. Inorg. Chem. 61, 284–290 (2016). https://doi.org/10.1134/S0036023616030153

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  • DOI: https://doi.org/10.1134/S0036023616030153

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