DIELECTRIC-RELAXATION STUDY OF ZNCL2 AND ZNBR2 SOLUTIONS IN WATER DMSO MIXTURES/

Dielectric spectra have been measured for the title systems up to 72 G Hz at 20 degrees C with salt concentrations less than or equal to 1 mo l/l. The results are described by a superposition of Debye terms. Two terms are sufficient for binary water/DMSO mixtures, while two additio nal lower frequency ones are required when salt is added. The results for both halides differ only little. The relaxation strengths of a ter m ascribable to ionic complexes and a term ascribable to water/DMSO (2 : 1)complexes vary in opposing sense, demonstrating the competition be tween those complexes.