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Abstract
The dielectric equation of state was determined in the Curie range for a PZLT ceramic from the values of the electric polarization measured as a function of the externally applied electric field. It was observed that in the Curie range there exists a temperature at which the absolute values of all determined Landau expansion coefficients show minimum. The above temperature has been identified as a temperature at which the induced polarization vanished after the externally applied field has been taken away. The tentative explanation of the observed phenomenon was given.