Hypersonic wave anomalies in Cs3H(SeO4)2 at the transitions above room temperature

被引：6
|
作者：
Luspin, Y [1 ]
Meneses, DD [1 ]
Simon, P [1 ]
Hauret, G [1 ]
机构：
[1] CNRS, Ctr Rech Mat Haute Temp, F-45071 Orleans 2, France
来源：
EUROPEAN PHYSICAL JOURNAL B | 1999年 / 10卷 / 02期
关键词：
D O I：
10.1007/s100510050848
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The elastic properties of Cs3H(SeO4)(2) are investigated by Brillouin spectroscopy in the temperature range 20-220 degrees C covering the two transitions III --> II and II --> I occurring at similar to 95 degrees C and similar to 187 degrees C; respectively. Phase I is known to be a protonic conductive one. Discontinuities of elastic constants are generally observed at both transitions, implying first orderness. In phases II and I, a slight broadening of the Brillouin lines is detected. The results are discussed in comparison with compounds of the families XHSeO4 (X = NH4, Rb and Cs) and CsH2BO4 (B = As and P) which also undergo a transition to a superionic phase. In the conductive phase, it appears that the lattice anharmonicity is weaker in Cs3H(SeO4)(2) than in these other compounds.
引用
收藏
页码：215 / 221
页数：7
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