Classical-nonclassical crossover behavior of critical and noncritical liquid binary solutions in a strong electric field.
A nitrobenzene-dodecane binary mixture has been studied with the use of the nonlinear dielectric effect for one critical and two noncritical concentrations in a series of frequencies (f(m)) in a weak measuring electric field. It has been found that for the temperature region where 1/f(m)>tau (tau, the lifetime of fluctuations), the critical exponent psi=gamma-2beta approximately equal to 0.59 and consequently exponents gamma (susceptibility) and beta (order parameter) exhibit nonclassical values. Close to the phase-transition temperature where 1/f(m)<tau, different patterns appear for critical and noncritical concentrations. For the latter the exponent psi tends to zero that may point to the classical behavior, with gamma approximately equal to 1 and beta-->0.5. For the critical concentration psi approximately equal to 0.4, this may be the consequence of the semiclassical behavior with gamma approximately equal to 1 and beta approximately equal to 0.325.
Zioło
J
J
Institute of Physics, Silesian University, ulica Uniwersytecka 4, 40-007 Katowice, Poland.
Rzoska
S J
SJ