Z. Pajak et al., POLYMORPHIC PHASE-TRANSITIONS AND MOLECULAR-MOTION IN PYRIDINIUM CHLOROCHROMATE, Chemical physics letters, 274(1-3), 1997, pp. 106-111
DTA, DSC, NMR and dielectric studies have been performed! for pyridini
um chlorochromate over a wide temperature range. A sequence of four so
lid-solid phase transitions was discovered, The in-plane complex reori
entation of the cation is described by a three-well potential model wi
th two correlation times, At higher temperatures one observes simultan
eous cation tumbling and diffusion. Thus existence of a new ionic plas
tic phase is revealed. The domain structure observed suggests ferroela
stic properties of the compound. (C) 1997 Elsevier Science B.V.