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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. etal., Condens. Matter Phys., 2005, 8, 881] that consistently takes into accountdiagonal components of the strain tensor, arising either due to externalpressures or due to thermal expansion. We calculate the related to thosestrains thermal, piezoelectric, and elastic characteristics of the system.Using the developed fitting procedure, a set of the model parameters is foundfor the case of Rochelle salt crystals, providing a satisfactory agreement withthe available experimental data for the hydrostatic and uniaxial pressuredependences of the Curie temperatures, temperature dependences of spontaneousdiagonal strains, linear thermal expansion coefficients, elastic constantsc_ij^E and c_i4^E, piezoelectric coefficients d_1i and g_1i (i=1,2,3). Thehydrostatic pressure variation of dielectric permittivity is described using aderived expression for the permittivity of a partially clamped crystal. Thedipole moments and the asymmetry parameter of Rochelle salt are found toincrease with hydrostatic pressure.

Mitsui model with diagonal strains: A unified description of external pressure effect and thermal expansion of Rochelle salt NaKC_4H_4O_6\cdot4H_2O