Vibrational spectroscopy of alkaline tungsten oxyfluoride crystals: structure, lattice dynamics, ordering processes, and phase transitions | Zendy

Vtyurin A. N. | Zendy; Gerasimova Ju. V. | Zendy; Krylov A. S. | Zendy; Ivanenko A. A. | Zendy; Shestakov N. P. | Zendy; Laptash N. M. | Zendy; Voyt E. I. | Zendy

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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.

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