The nature of spontaneous twisting of (NH4)2SO4 crystals at the curie point |
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Authors: | S A Gridnev O N Ivanov A T Kosilov |
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Institution: | (1) Voronezh State Technical University, Moskovskii pr. 14, Voronezh, 394026, Russia |
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Abstract: | Spontaneous twisting of (NH4)2SO4 crystals at the phase transition from the paraelectric phase Pnam to the ferroelectric phase Pna2 (T C = 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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