Title: Influence of electric fields on dielectric properties of GPI 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) ,
	I.V. Stasyuk (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine)

Using modified microscopic model of GPI by taking into account the piezoelectric coupling with strains ε_i in the frames of two-particle cluster approximation, the components of polarization vector and static dielectric permittivity tensor of the crystal at applying the external transverse electric fields E₁ and E₃ are calculated. An analysis of the influence of these fields on thermodynamic characteristics of GPI is carried out. A satisfactory quantitative description of the available experimental data for these characteristics has been obtained at a proper choice of the model parameters.

Key words: ferroelectrics, electric field, polarization, dielectric permittivity, phase transition
PACS: 77.22.-d, 77.22.Ch, 77.22.Ej, 77.65.-j, 77.80.Bh

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