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Birefringence imaging of phase transition in ferroelastic Li2TiGeO5
被引:6
|作者:
Sieradzki, A
Cizman, A
Poprawski, R
Shuvaeva, V
Glazer, AM
机构:
[1] Wroclaw Univ Technol, Inst Phys, PL-50370 Wroclaw, Poland
[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
关键词:
phase transition;
ferroelastic;
birefringence;
critical exponent;
D O I:
10.1080/01411590412331317103
中图分类号:
O7 [晶体学];
学科分类号:
0702 ;
070205 ;
0703 ;
080501 ;
摘要:
The ferroelastic phase transition in Li2TiGeO5 at 233.5 K was studied using an imaging version of the rotating-polariser method in the temperature range 110-290K. The temperature dependences of the spontaneous birefringence and the extinction angle in the ferroelastic phase were determined. The evolution of the ferroelastic domain structure was observed. The critical behaviour of the linear birefringence studied at the tetragonal-orthorhombic phase transition was observed. The numerical value of the exponent beta obtained from the experiment was 0.673 +/- 0.004.
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页码:351 / 356
页数:6
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