Acta Crystallographica Section C

Crystal Structure Communications

Volume 62, Part 6 (June 2006)

inorganic compounds

Acta Cryst. (2006). C62, i49-i52 [ doi:10.1107/S0108270106016350 ]

Dirubidium fluorotrioxophosphate, Rb₂PO₃F, at 290 and 130 K, and dicaesium fluorotrioxophosphate, Cs₂PO₃F, at 240 and 100 K

J. Fábry, M. Dusek, K. Fejfarová, R. Krupková, P. Vanek and I. Císarová

Abstract: The structure of Rb₂PO₃F was determined at 290 and 130 K, while that of Cs₂PO₃F was determined at 240 and 100 K. Both compounds belong to the [beta] -K₂SO₄ family. The structure analysis did not reveal signs of a phase transition in either compound. Crystal chemical considerations do not favour the presence of a phase transition in either Rb₂PO₃F or Cs₂PO₃F. However, glass-like phase transitions were observed by differential scanning calorimetry in slightly humid samples at 175 and 177 K for Rb₂PO₃F and Cs₂PO₃F, respectively, but were not observed in well dried samples. The bond distances are normal and Cs₂PO₃F is twinned.

Formula: Rb₂PO₃F and Cs₂PO₃F


	Structure factor file (CIF format) (30.5 kbytes) [ doi:10.1107/S0108270106016350/sq3009I_290sup2.hkl ] Contains datablock I_290

	Structure factor file (CIF format) (30.2 kbytes) [ doi:10.1107/S0108270106016350/sq3009I_130sup3.hkl ] Contains datablock I_130

	Structure factor file (CIF format) (47.0 kbytes) [ doi:10.1107/S0108270106016350/sq3009II_240sup4.hkl ] Contains datablock II_240

	Structure factor file (CIF format) (45.3 kbytes) [ doi:10.1107/S0108270106016350/sq3009II_100sup5.hkl ] Contains datablock II_100

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