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

页码：215 / 221

页数：7

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