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Vibrational spectroscopy of alkaline tungsten oxyfluoride crystals: structure, lattice dynamics, ordering processes, and phase transitions
Author(s) -
Vtyurin A. N.,
Gerasimova Ju. V.,
Krylov A. S.,
Ivanenko A. A.,
Shestakov N. P.,
Laptash N. M.,
Voyt E. I.
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2637
Subject(s) - octahedron , raman spectroscopy , crystallography , hydrogen bond , crystal structure , phase transition , chemistry , tungsten , infrared spectroscopy , raman scattering , ammonium , infrared , molecule , physics , organic chemistry , quantum mechanics , optics
Raman scattering (RS) and infrared absorption (IR) of ammonium oxyfluoride crystals (NH 4 ) 3 WO 3 F 3 , (NH 4 ) 2 KWO 3 F 3 , and Cs 2 (NH 4 )WO 3 F 3 are compared. Conformation of the WO 3 F 3 octahedral groups has been established; anomalies have been found close to the transition temperatures in the internal vibrational regions of ammonium and WO 3 F 3 groups. The phase transition in (NH 4 ) 3 WO 3 F 3 is associated mostly with the ordering of octahedral groups and formation of WO···HN hydrogen bonds. In (NH 4 ) 2 KWO 3 F 3 crystal, the transition is not related to the ordering processes; Cs 2 (NH 4 )WO 3 F 3 retains its disordered structure down to 10 K. Copyright © 2010 John Wiley & Sons, Ltd.