Frequency-Dependent Specific Heat and Thermal Conductivity at the Glass Transition ino-Terphenyl Mixtures

Abstract

We report frequency-dependent measurements of the specific heat $c_p$ thermal conductivity $\kappa$ of ${(o-\mathrm{t}\mathrm{e}\mathrm{r}\mathrm{p}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{y}\mathrm{l})}_{1-x}{(o-\mathrm{p}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{y}\mathrm{l}\mathrm{p}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{o}\mathrm{l})}_x$ mixtures near the glass transition. $\kappa$ is flat and frequency independent and all of the dynamics is contained in $c_p$. The mean relaxation time $\tau$ shows non-Arrhenius behavior and the distribution of times broadens with decreasing temperature. The divergence of both $\tau$ and the width of the distribution is consistent with the Kauzmann temperature.