Title: The effect of hydrostatic pressure on thermodynamic characteristics of NH₃CH₂COOH·H₂PO₃ type ferroelectric materials
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)

The model of NH₃CH₂COOH·H₂PO₃, modified by taking into account the piezoelectric coupling between the ordering structure elements and the strains ε_i, ε_j, is used for investigation of the effects that appear under external pressures. Within two-particle cluster approximation, the components of polarization vector and static dielectric permittivity tensor of the mechanically clamped and free crystals, their piezoelectric and thermal characteristics are calculated. The effect of hydrostatic pressure on the phase transition and the calculated physical characteristics of the crystal is studied. A good quantitative description of experimental data for these crystals is obtained.

Key words: ferroelectrics, phase transition, dielectric permittivity, piezoelectric coefficients, hydrostatic pressures
PACS: 77.22.-d, 77.22.Ch, 77.22.Ej, 77.65.-j, 77.80.Bh

Full text [pdf]

<< List of papers