Determining Coefficients in an Expansion of the Electric Energy of A2ВХ4 Group Crystals According to Polarization by Studying the Dynamics of Repolarization via Harmonic Analysis

Abstract

Coefficients of the expansion of electrical energy \({{W}_{c}}\) in the ferroelectric phase near phase transition temperature \({{T}_{c}}\) are determined from an even power series according to polarization \({{P}_{c}}\) by studying the dynamics of repolarization in A₂BX₄ group crystals according to the Landau–Ginzburg–Devonshire theory. Experimental results are compared to the theoretical concepts of the Landau–Ginzburg–Devonshire theory describing dependences \({{W}_{c}}({{P}_{c}})\) in static.