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5.7 Ternary system nitroethane-3-methylpentane-cyclohexane

Figure 5.54: Left Figure: Plot of coupling constant |g| versus weight fraction of (3MP); Right figure: Plot of coupling constant |g| versus fluctuation correlation length ξ0; •, |g| derived from Sbg BF; ♦, |g| derived from Sc BF.

where xn c(n = NE,3MP,CH) is the mole fraction of each component and Cpb denotes the background part of the heat capacity. Values for the pure components have been taken from literature [141]. Because of the temperature dependence in the critical amplitude in the ultrasonic spectra, two different critical amplitudes have been used in order to verify the coupling constant g. The critical amplitude at the critical point Sc BF and the critical amplitude from the background Sbg BF which are nearly identical. The evaluated parameters are presented in Table (5.8). The behavior of the coupling constant follows again the shape of the fluctuation correlation length, Fig.(5.54). In the right plot of Fig.(5.54), the coupling constant is displayed versus ξ0.

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