Mitsui对角应变模型：NaKC_4H_4O_6 \cdot 4H_2O外压效应和热膨胀的统一描述
Mitsui model with diagonal strains: A unified description of external pressure effect and thermal expansion of Rochelle salt NaKC_4H_4O_6\cdot4H_2O
摘要：
本文详细阐述了[LevitskiiiR.R.例如，物理版本B 2003，67，174112]和[Levitskii R.R.例如，康登斯物质物理学，2005，8，881]，其始终考虑应变张量的对角分量，该对角分量由于外部压力或由于热膨胀而产生。我们计算了与这些应变相关的系统的热、压电和弹性特性。利用所发展的拟合方法，找到了一组适用于罗谢尔盐晶体的模型参数，其居里温度与流体静力学和单轴压力的关系、自发对角应变与温度的关系、线性热膨胀系数、弹性常数c_ij^E和c_i4 ^E，压电系数d_1i和g_1i（i= 1，2，3）。利用导出的部分固持晶体介电常数的表达式描述了介电常数在静水压力下的变化。结果表明，罗歇尔盐的偶极矩和不对称性参数随静水压力的增大而增大。
英文摘要：
We elaborate a modification of the deformable two-sublattice Mitsui model of [Levitskii R.R. et al., Phys. Rev. B. 2003, 67, 174112] and [Levitskii R.R. et al., Condens. Matter Phys., 2005, 8, 881] that consistently takes into account diagonal components of the strain tensor, arising either due to external pressures or due to thermal expansion. We calculate the related to those strains thermal, piezoelectric, and elastic characteristics of the system. Using the developed fitting procedure, a set of the model parameters is found for the case of Rochelle salt crystals, providing a satisfactory agreement with the available experimental data for the hydrostatic and uniaxial pressure dependences of the Curie temperatures, temperature dependences of spontaneous diagonal strains, linear thermal expansion coefficients, elastic constants c_ij^E and c_i4^E, piezoelectric coefficients d_1i and g_1i (i=1,2,3). The hydrostatic pressure variation of dielectric permittivity is described using a derived expression for the permittivity of a partially clamped crystal. The dipole moments and the asymmetry parameter of Rochelle salt are found to increase with hydrostatic pressure.
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