The nature of spontaneous twisting of (NH4)2SO4 crystals at the curie point

被引：0
|
作者：
S. A. Gridnev
O. N. Ivanov
A. T. Kosilov
机构：
[1] Voronezh State Technical University,
来源：
Crystallography Reports | 2004年 / 49卷
关键词：
Phase Transition; Curie Point; Ferroelectric Phase; Paraelectric Phase; Torsion Pendulum;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Spontaneous twisting of (NH4)2SO4 crystals at the phase transition from the paraelectric phase Pnam to the ferroelectric phase Pna2 (TC = 223 K) was studied using the method of low-frequency torsion pendulum. It is shown that the macroscopic twisting of samples is caused by the rearrangement of ferroelastic twins with the {011} and {031} twinning planes existing in both the paraelectric and ferroelectric phases. A model interpreting the effect of the spontaneous twisting below the ferroelectric Curie point is proposed.
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页码：463 / 468
页数：5
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