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

Jan Fábry; Michal Dusek; Karla Fejfarová; Radmila Krupková; Premysl Vanek; Ivana Císarová

doi:10.1107/S0108270106016350

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

Acta Crystallogr C. 2006 Jun;62(Pt 6):i49-52. doi: 10.1107/S0108270106016350. Epub 2006 May 24.

Authors

Jan Fábry¹, Michal Dusek, Karla Fejfarová, Radmila Krupková, Premysl Vanek, Ivana Císarová

Affiliation

¹ Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czech Republic. fabry@fzu.cz

PMID: 16763294
DOI: 10.1107/S0108270106016350

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.