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The model of glycine phosphite (GPI) ferroelectric, modified by taking into account the piezoelectric coupling between the ordering structure elements and the lattice strains εj , is used for the investigation into the effects appearing under shear stresses σ5, σ6 and electric field E3. Within the framework of the two particle cluster approximation, the components of the polarization vector and the static dielectric permittivity tensor of a mechanically clamped crystal, and also their piezoelectric and thermal characteristics are calculated. The simultaneous effects of shear stress σ5 and field E3 as well as the effects of stress σ6 and field E3 on the phase transition and physical characteristics of the crystal are studied.

Effect of stresses σ_5, σ_6 and electric field E_3 on thermodynamic characteristics of GPI ferroelectric