Knowledge Bank

Dielectric relaxation measurements in the frequency range of 10 MHz--10 GHz have been carried out in t--butyl alcohol-water mixtures with various concentrations over the temperature range 273 K - 313 K using a time domain reflectometry (TDR) method. The bilinear calibration method as suggested by $Cole1$ as been used to correct the permittivity spectra. The corrected spectra can be fitted with a single relaxation time with small amount of Cole-Davidson behaviour. Deviations from ideal mixing behaviour in permittivity parameter ($ϵ0-ϵ0$) and relaxation time($\tau$) suggested formation of the polymeric strcuture in t-butyl alcohol-water mixtures. The dielectric relaxation behaviour shows the same structural changes as observed in ultrasonic $relaxation2$. However, the maxima in excess permittivity and excess relaxation time occur at different positions. This can not be explained by simple model of the polymeric structure.