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

Описание

Тип публикации: статья из журнала

Год издания: 2010

Идентификатор DOI: 10.1002/jrs.2637

Ключевые слова: Raman scattering, infrared absorption, alcaline tungsten oxyfluorides, phase transitions, alcaline tungsten oxyfluorides, infrared absorption, phasetransitions, Raman scattering

Аннотация: 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 regioПоказать полностьюns 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 W-O center dot center dot center dot H-N 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 (C) 2010 John Wiley & Sons, Ltd.

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Издание

Журнал: JOURNAL OF RAMAN SPECTROSCOPY

Выпуск журнала: Vol. 41, Is. 12

Номера страниц: 1784-1791

ISSN журнала: 03770486

Место издания: MALDEN

Издатель: WILEY-BLACKWELL

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