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The infra-low frequency elastic modulus and the complex dielectric permittivity of vinylidene fluoride trifluoroethylene VDF 70 /Tr 30 , are studied within the temperature range of 20 ÷ 140 °C. The experimental results are used to determine the temperature dependence of order parameter  η  near the Curie temperature ( Tc ). It is revealed that spontaneous polarization  Ps  and spontaneous strain  x sare linearly coupled. The dielectric dispersion, due to the relaxation dynamics of polar microregions in the vicinity of the  Tc , is found. The average relaxation time follows the Arrhenius law with activation energy depending on temperature.

Elastic and dielectric responses of VDF 70 /Tr 30 near ferroelectric phase transition