Abstract
The dielectric behavior of polycrystalline pyridinium tetrafluoroborate, C5NH6BF4, has been investigated in detail at temperatures in the range of 120 K ≤ T ≤ 280 K and frequencies in the range of 10 Hz ≤ ν ≤ 105 Hz. The marked dielectric dispersion observed at temperatures below 205 K was analyzed by using the sum of two different relaxation processes. The temperature dependence of the relaxation time for the main one with dominant strength revealed an excellent fit to the Arrhenius equation with an activation energy E = 2702 ± 6 K and a pre-exponential factor τ0 = 2.2 × 10-11 s. The coupled reorienting motion of the pyridinium cation and the BF4 anion is suggested to account for the main process. The relaxation time for the other weak process also obeys the Arrhenius law with E = 815±14 K and τ0 = 7.9×10-5 s. The origin of the weak process is ascribed to the ferroelectric domain-wall motion.
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