Abstract
Dielectric relaxation of ferroelectric pyridinium tetrafluoroborate single crystal was measured as a function of hydrostatic pressure and temperature. High-pressure caused a shift the ferroelectric-paraelectric phase transition at T1=238.7 K as well as the non-ferrolectric phase transition at T2=204 K towards higher temperatures. The influence of pressure on the critical slowing down process at the ferroelectric-paraelectric phase transition was analyzed. Moreover, in the low temperature phase (below 204 K) a relaxation process, characterized by an enthalpy of 13.2 kJ/mole, was observed. The activation enthalpy of the process was found to increase linearly with pressure.
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