Abstract
Abstract The permittivity and dielectric loss of methyl and ethyl trifluoroacetates have been measured at three microwave frequencies viz., 24.50, 18.26 and 9.83 GHz and also at 1 MHz and optical frequency at 35°C, in dilute solutions of benzene and decalin. The permittivity and dielectric loss at different frequencies have been plotted against concentration (wt. fraction). The slopes of these straight lines have been used for the complex plane plots (a″ vs a′), which in the case of benzene are Debye semi-circles for the main dispersion region while in decalin are Cole-Cole arcs which show symmetrical distribution of relaxation times. The dispersion curve for these compounds in decalin could not be resolved into two distinct Debye curves because of overlapping of the two dispersion regions. The data have been analysed in terms of two relaxation processes corresponding to overall and group rotations.
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