Static and dynamic pyroelectric coefficients of polyvinylidene fluoride over a 90-370 K temperature range

The static and the real and imaginary components of the dynamic pyroelectric coefficients were measured on a film of polyvinylidene fluoride (PVF₂) over a 90-370 K temperature range. These are the first pyroelectric coefficients of PVF₂ measured at extremely low temperatures, and the first complex dynamic pyroelectric coefficients reported in the literature. The static coefficient was small and constant below the glass transition temperature T_g, but increased very rapidly above T _g. The real dynamic coefficient was in good qualitative agreement with the static value. The imaginary dynamic coefficient had a complicated frequency dependence which can be used to examine elastic and piezoelectric relaxation processes.