Nature of phase transitions in ammonium oxofluorovanadates, a vibrational spectroscopy study of (NH₄)₃VO₂F₄ and (NH₄)₃VOF₅

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• 作者：Yu.V. Gerasimova^a ; ^b ; A.S. Oreshonkov^a ; ^b ; N.M. Laptash^c ; A.N. Vtyurin^a ; ^b ; A.S. Krylov^a ; N.P. Shestakov^a ; A.A. Ershov^a ; ^b ; ^{jul@iph.krasn.ru} ; A.G. Kocharova^a
• 关键词：Ammonium oxofluorovanadates ; Order-disorder ; Dynamics ; Phase transitions ; Infrared ; Raman
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：2017
• 出版时间：5 April 2017
• 年：2017
• 卷：176
• 期：Complete
• 页码：106-113
• 全文大小：1447 K
• 卷排序：176

文摘

Vibrational spectroscopy is indispensable for study PTs in (NH4)3VO2F4 and (NH4)3VOF5. The cis-conformation of VO2F43 − was justified From one to seven independent octahedra in the structure of (NH4)3VOF5 during PTs Ammonium groups are mainly responsible for the PTs at low temperature.