NIR FT Raman study of phase transitions in ferroelectric pyridinium periodate

被引:13
作者
Pajak, Z
Polomska, M
Wolak, J
机构
[1] Adam Mickiewicz Univ, Inst Phys, PL-61614 Poznan, Poland
[2] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland
关键词
ferroelectrics; order-disorder effects; phase transitions; inelastic light scattering;
D O I
10.1016/S0038-1098(01)00232-0
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
NIR FT Raman study has been performed for pyridinium periodate, a new room temperature ferroelectric. over a wide range of temperatures. The existence of two solid-solid phase transitions was confirmed. The molecular dynamics examined for the first time of both (C5H6N)(+) cation and (IO4)(-) anion was shown to be evidently related to the observed transitions. The temperature dependences of some characteristic frequencies of both ions point to a kind of coupling between them. The critical behaviour of the internal vibrations of the tetrahedral anion reflecting partially the critical behaviour of the noncentrosymmetrical pyridinium cation was revealed. The cation-anion coupling is considered to be responsible fur the long-range ordering leading to the appearance of ferroelectricity for the compound under study. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:137 / 141
页数:5
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