The model of the glycine phosphite crystal, modified by taking into account of piezoelectric coupling of ordering structure elements with the lattice strains, is used for investigation of piezoelectric characteristics of the crystal. In the frames of two-particle cluster approximation the transverse piezoelectric coefficients are calculated. The influences of hydrostatic, uniaxial pressures, shear stresses and transverse electric fields on the transverse piezoelectric coefficients of the crystal are studied.
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