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.
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