MOLECULAR MOTIONS IN A MOLECULAR-CRYSTAL - TETRACHLORO-M-XYLENE

In the present work we report a study of the molecular relaxation proc esses in tetrachloro-m-xylene in the solid state. The techniques of di electric relaxation spectroscopy and thermally stimulated discharge cu rrents were used in order to identify and characterise the different r elaxation processes and it was found that a solid relator phase appear s on heating al a temperature of similar to - 125 degrees C. It was al so observed by thermally stimulated currents that a higher temperature relaxation occurs above similar to -15 degrees C. The attribution, at the molecular level, of this relaxation is not straightforward and it was suggested that it probably corresponds to the onset of the self-d iffusional motions in the solid.