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The model of NH$_3$CH$_2$COOH$\cdot$H$_2$PO$_3$, modified by taking intoaccount the piezoelectric coupling between the ordering structure elements andthe strains $\varepsilon_i$, $\varepsilon_j$, is used for investigation of theeffects that appear under external pressures. Within two-particle clusterapproximation, the components of polarization vector and static dielectricpermittivity tensor of the mechanically clamped and free crystals, theirpiezoelectric and thermal characteristics are calculated. The effect ofhydrostatic pressure on the phase transition and the calculated physicalcharacteristics of the crystal is studied. A good quantitative description ofexperimental data for these crystals is obtained.

The effect of hydrostatic pressure on thermodynamic characteristics of NH$_3$CH$_2$COOH$\cdot$H$_2$PO$_3$ type ferroelectric materials