Results of measurements of the specific heat capacity of n‐butoxyethanol/water and iso‐butoxyethanol/water of critical composition as function of temperature are reported. Both systems have in common that in the vicinity of the critical temperature aggregates of butoxyethanol molecules and concentration fluctuations with unusual long range correlations (critical amplitude ξ0+ ≈︁ 0.4 nm) coexist. The analysis of the data shows that both systems belong to the same universality class as “simple” binary mixtures. The value of the critical amplitude ratio of specific heat capacity (A/A+) and the value of the critical exponent α are consistent with the predictions of the Landau‐Ginzburg‐Wilson model (d = 3, n = 1). The same is true for the value of the amplitude ratio RA,ξ+ calculated from the specific values of the critical amplitudes ξ0+ and A+.
A fully automated apparatus is described for the in situ measurement oflight scattering in glass forming systems during heat treatment. Its furnace and regulator provide high-temperature change rates of the order of several K/s. Additionally the sample temperature can be kept constant to within 0.1 K for several days in ranges up to 900°C. A He~Ne laser provides linearly polarized light and the light scattered under 90° (or 1 SO) is detected using photodiodes and lock-in amplifiers.
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