DIELECTRIC-RELAXATION SPECTROSCOPY OF ELECTROLYTE-SOLUTIONS - ZNCL2 IN N-METHYL-2-PYRROLIDONE, TETRAMETHYLUREA AND ETHYLACETATE

The dielectric spectra of the title systems (with moderate to high sal t concentrations) have been measured between MHz frequencies and 72 GH z at 20, 40 and 60 degrees C (EtAc only 20 degrees C). Apart from the conductivity contribution, there are two evidently discernible relaxat ion contributions. These are ascribed to unaffected solvent (at higher frequencies) and, on the other hand, to affected solvent and to ionic species (at lower frequencies). The nature of the latter and their re laxation mechanism are discussed by comparing the respective relaxatio n parameters with those of other liquid systems.