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, phasetransitions
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.
Журнал: JOURNAL OF RAMAN SPECTROSCOPY
Выпуск журнала: Vol. 41, Is. 12
Номера страниц: 1784-1791
ISSN журнала: 03770486
Место издания: MALDEN
Издатель: WILEY-BLACKWELL