Piezoelectric Effect in Rochelle salt 5 positions. The resulting Hamiltonian is of the following form:

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We calculated dielectric, piezoelectric and elastic properties of the Rochelle salt within the Mitsui model extended by piezoelectric interaction and transverse field. This field occurs due to dynamic flipping of ordering structure elements between two equilibrium positions. We the studied static characteristics within molecular field approximation. We derived unique parameter set that allows us to achieve a better description of the physical characteristics (particularly for spontaneous polarization) as compared with the analogous model that does not take into account transverse field.