2成分臨界溶液における超音波吸収

抄録

Ultrasonic absorption coefficients in critical binary mixture of nitrobenzene-n-hexane have been analyzed by the method of D'Arrigo et al. based on Fixman's multi-relaxation theory. Characteristic parameters due to the rate of decay of critical fluctuation have been estimated from these data as a function of the temperature.
For our purposes it is convenient to write the results of the Fixman's theory in the following form
/f2 = af-1[fD-1/4[d1/2Tm[f(d)]]] + B
where fD is acharcterisitic frequency due to the rate of decay of critioal fluctuation, d is a reduced variable (fD/f)1/2 and A is a parameter of reiaxation absorption as a function of the thermodynamic quantity.
Present results of the dependency of characteristic frequency fD upon the temperature has been supported by Scaling Law's prediction and by Mictura's results analyzed in terms of the Fixman-Kawasaki's theory. But it has been found that the temperature dependence of the parameter A can not be explanined by Fixman theory.