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Schematic outline of the changes of the relaxation-time dispersion in terms of with temperature across the range from . This example displays a considerable narrowing of the distribution of relaxation times as the temperature is increased, unlike systems that follow time-temperature superposition.
Dielectric loss spectra of neat -terphenyl for different temperatures. In the order of low to high peak frequency, the temperature varies from in steps of . The relaxation strength is . Data taken from Ref. 23, where only a fraction of the measurements are shown.
Temperature dependence of the peak relaxation-time constant , obtained by analyzing the data of Fig. 2. The line represents according to the VFT law of Eq. (1) with , , and .
Master plot of the dielectric loss data of neat -terphenyl shown in Fig. 2. The abscissa is scaled using the peak frequency , the ordinate is scaled as . This graph demonstrates that time-temperature superposition is applicable across the present temperature range.
Dielectric loss spectra of neat -terphenyl measured at two temperatures, 258 and , taken from Ref. 25. The lines are KWW fits with a common exponent of . The fits were performed by Leon and Ngai; see Ref. 26.
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