Critical Phenomena / Light. Scattering / Liquids / Phase Transitions / Solutions Measurements of the Rayleigh-Brillouin spectra of the binary system nitroethane-isooctane have been carried out as function of temperature and concentration. The purpose of this investigation was to study the transition of one type of phase transformation to an other. Taking the temperature as variable, the phase transformation is of second order for one specific concentration -the critical concentration, whereas for other concentrations it is of first order. Samples deviating up to 20% from the critical composition have been investigated in the temperature range 10 to 10-3 K above the transition temperature in the homogeneous region. The temperature dependence of the Rayleigh-Brillouin intensity ratio 1,/2/ b can be described by the same critical exponent y = 1.24 for all concentrations provided the critical temperature in the scaling function is replaced by another reference temperature, interpreted as pseudo-spinodal temperature T s *' The concentration dependence of T s* is found to be IX -Xci = A· tt*, where t, is the reduced temperature t, = 1 -Ts*/T c. The value ofthe exponent is found to be P* = 0.5, which is the classical exponent of the spinodal curve.
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