NIR Raman studies of superionic phase transition in (NH4)(4)H-2(SeO4)(3)

被引：13
|
作者：
Polomska, M
机构：
[1] Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznań
来源：
JOURNAL OF MOLECULAR STRUCTURE | 1997年 / 404卷 / 1-2期
关键词：
Raman spectroscopy; molecular group dynamics; phase transition; tetraammonium dihydrogen triselenate; superionic phase;
D O I：
10.1016/S0022-2860(96)09379-9
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Near-infrared Fourier transform Raman spectroscopy has been used to study the molecular group dynamics in (NH4)(4)H-2(SeO4)(3) single crystal in the vicinity of its superionic phase transition (T-s similar or equal to 378 K). A change in the dynamics of SeO4 and SeO4H entities begins about 15 K below T-s and ends at T-s. The results of the Raman studies of (NH4)(4)H-2(SeO4)(3) gave evidence that the orientational disorder of SeO4 tetrahedra is responsible for the fast protonic conductivity. A very large temperature hysteresis (similar to 30 K) for the superionic phase transition in (NH4)(4)H-2(SeO4)(3) was found. (C) 1997 Elsevier Science B.V.
引用
收藏
页码：181 / 186
页数：6
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