Abstract
The model of NH$_3$CH$_2$COOH$\cdot$H$_2$PO$_3$, modified by taking into account the piezoelectric coupling between the ordering structure elements and the strains $\varepsilon_i$, $\varepsilon_j$, 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.
Highlights
The study of the effects that appear under external pressures is one of the urgent problems in the physics of ferroelectric materials
It is necessary to note that an acceptable description of an external hydrostatic pressure effect on the phase transition and physical characteristics for many ferroelectric crystals of KH2PO4 family was made in [1, 2], for quasione-dimentional CsH2PO4 type ferroelectrics — in [3], for monoclinic RbD2PO4 — in [4], for RbH2SO4 crystal — in [5]
In [6], on the basis of the proposed model of deformed NH3CH2COOH·H2PO3 (GPI) type ferroelectrics, the dielectric, piezoelectric, elastic and thermal characteristics of these crystals were calculated in the two-particle cluster approximation and a good quantitative description of the available experimental data for these characteristics was obtained
Summary
The study of the effects that appear under external pressures is one of the urgent problems in the physics of ferroelectric materials. In [6], on the basis of the proposed model of deformed NH3CH2COOH·H2PO3 (GPI) type ferroelectrics, the dielectric, piezoelectric, elastic and thermal characteristics of these crystals were calculated in the two-particle cluster approximation and a good quantitative description of the available experimental data for these characteristics was obtained. An experimental study of hydrostatic pressure effect on the physical properties of GPI type crystals was carried out in [8, 9]. The hydrostatic pressure effect on the phase transition, thermodynamic, dielectric, piezoelectric and elastic characteristics of this type of crystals is studied based on the model of a deformed GPI crystal [6].
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