Influence of the uniaxial stress $p_2$ and transverse fields $E_1$ and $E_3$ on the phase transitions and thermodynamic characteristics of GPI ferroelectric materials

A modified GPI model that accounts for the piezoelectric coupling between the ordered structural elements and the strains $\varepsilon_j$ has been used for studing of effects arising in GPI ferroelectrics under the action of the uniaxial stress $p_{2}$ and electric fields $E_1$ and $E_3$.  The  polarization vectors and components of static dielectric permittivity are calcucated in the two-particle cluster approximation for mechanically clamped  crystal, and piezoelectric and thermal parameters are also determined.  The influence of the simultaneous action of the stress $p_{2}$ and fields $E_1$ and $E_3$ on the phase transition and physical characteristics of GPI crystal has been studied.

ferroelectrics
фазовий перехід
dielectric permittivity
piezoelectric modules
shear stress

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