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The pressure influence on the incommensurate-commensurate ferroelectric phase transition in [4-NH_2C_5H_4NH][SbCl_4]

机译:压力对[4-NH_2C_5H_4NH] [SbCl_4]中不等量-相称铁电相变的影响

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摘要

The dielectric properties of the [4-NH_2C_5H_4NH] SbCl_4 (abbreviated as 4-APCA) crystal were investigated under hydrostatic pressure up to 300 Mpa. The pressure-temperature phase diagram was given. The paraelectric-ferroelectric phase transition (Ⅱ → Ⅲ) temperature (T_c) increases linearly with increasing pressure with a slope dT_c/dp = 21 x 10~(-2) K/MPa. The pressure dependence of Curie-Weiss constants has been evaluated also. In the paraelectric phase (Ⅱ) the Curie constant (C_+) was pressure dependent whereas the C_ constant over the ferroelectric phase (Ⅲ) was almost constant. The results are interpreted in terms of improper and displacive type phase transition model with a soft phonon at a zone boundary.
机译:在高达300 Mpa的静水压力下研究了[4-NH_2C_5H_4NH] SbCl_4(缩写为4-APCA)晶体的介电​​性能。给出了压力-温度相图。顺电-铁电相变(Ⅱ→Ⅲ)温度(T_c)随着压力的增加而线性增加,斜率dT_c / dp = 21 x 10〜(-2)K / MPa。还对居里-魏斯常数的压力依赖性进行了评估。在顺电相(Ⅱ)中,居里常数(C_ +)与压力有关,而在铁电相(Ⅲ)中的C_常数几乎是常数。根据在区域边界处具有软声子的不正确和位移型相变模型来解释结果。

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