DIELECTRIC RELAXATION SPECTRA OF T-BUTYL ALCOHOL-WATER MIXTURE USING TIME DOMAIN REFLECTOMETRY

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1991

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Ohio State University

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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 $Cole^{1}$ 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 ($\epsilon_{0}-\epsilon_{0}$) 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 $relaxation^{2}$. 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.

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$^{1}$R. H. Cole, J. G. Berberian, S. Mashimo, G. Chryssikos, A. Burns and E. Tombari, J. Appl. Phys. 66(2), 793 (1989.) $^{2}$M. Tabellout, P. Lanceleur, J. R. Emery, D. Hayward and R. A. Pethrick, J. Chem. Soc. Faraday Trans. 86(9), 1493 (1990).""
Author Institution: Department of Physics, Marathwada University

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