NEUTRON, NUCLEAR-MAGNETIC-RESONANCE, AND DIELECTRIC STUDY OF ION MOTION IN PYRIDINIUM HEXAFLUOROPHOSPHATE

Extensive investigation of polycrystalline pyridinium hexafluorophosph ate and its perdeuterated analog was performed by neutron scattering, NMR, and dielectric methods in a wide temperature range. The results o f different spectroscopic methods enabled us to propose a general mode l of both ion reorientations and to determine their activation paramet ers. The aging effects observed slightly change the hindering barriers and significantly affect the phase transition temperature and the pyr idinium cation dynamics. (C) 1996 American Institute of Physics.