Paramagnetic defects as probes for the study of ferroelastic phase transition in lithium niobate and lithium tantalate under high pressure

被引：0
|
作者：
Malovichko, G [1 ]
Grachev, V
Andreev, V
Nachal'naya, T
机构：
[1] Univ Osnabruck, Dept Phys, D-4500 Osnabruck, Germany
[2] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA
[3] Ukrainian Acad Sci, Inst Superhard Mat, Kiev, Ukraine
来源：
RADIATION EFFECTS AND DEFECTS IN SOLIDS | 2002年 / 157卷 / 6-12期
关键词：
EPR; Cr3+; lithium niobate; lithium tantalate; high pressure;
D O I：
10.1080/10420150215834
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
It was found by optical polarization microscopy and the EPR study that lithium niobate and tantalate crystals undergo irreversible lattice changes under anisotropic hydrostatic compression. Regions having different cell orientations were registered. The observed changes were explained in terms of "strain switching" of ferroelastic domains. Possible sequence of phase transitions in these crystals (Pm3m<->R (3) over bar3 c<->R 3 c) and the symmetry of the condensed soft modes ( R-25 and Gamma(15) , correspondingly) were obtained by the analysis of the Gibbs free energy under external pressure.
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收藏
页码：1085 / 1088
页数：4
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