Title: Deformation effects in glycinium phosphite ferroelectric
Author(s):

	I.R. Zachek (Lviv Polytechnic National University, 12 Bandera St., 79013 Lviv, Ukraine) ,
	R.R. Levitskii (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine) ,
	A.S. Vdovych (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine)

To study the effects appearing under mechanical stresses, we have used the model of glycinium phosphite ferroelectric, modified by taking into account the piezoelectric coupling of ordering structure elements with lattice strains. In the frames of two-particle cluster approximation, the components of polarization vector and static dielectric permittivity tensor of the crystal, as well as its piezoelectric and thermal characteristics are calculated. Influence of shear stresses, hydrostatic and uniaxial pressures on the phase transition and physical characteristics of the crystal is studied.

Key words: ferroelectrics, phase transition, dielectric permittivity, piezoelectric characteristics, mechanical stress
PACS: 77.22.-d, 77.22.Ch, 77.22.Ej, 77.65.-j, 77.80.Bh

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