Abstract
Temperature dependences of hypersound velocity V(T) in solutions with different guanidine hydrochloride (GdnHCl) concentrations have been studied by Brillouin light scattering at temperatures from 263 to 353 K. It has been shown that for low GdnHCl concentrations the V(T) dependence has a pronounced maximum. An increase in the GdnHCl concentration in the solution is accompanied by a shift of the maximum towards lower temperatures and also an increase in the absolute value of hypersound velocity and, hence, a decrease in the adiabatic compressibility in the entire temperature range studied. The temperature dependence of adiabatic compressibility at low concentrations of GndHCl is ploted. The contribution of relaxation processes to the temperature behavior of hypersound attenuation in GndHCl solutions is determined. It is shown that their behavior is thermally activated and described by Arrhenius ' law. The values of activation energy of relaxation processes are calculated. Possible mechanisms underlying the effects observed are considered.
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