The alpha-relaxation process in simple glass forming liquid m-toluidine. II. The temperature dependence of the mechanical response

We have measured, as a function of temperature and frequency, the velocity and attenuation of sound down to the glass transition of the fragile glass- forming molecular liquid m-toluidine. The mechanical relaxation process is compared with the dielectric one recently studied on the same substance. Th e Arrhenius plot of log(tau) vs 1/T shows that the relaxation time associat ed with ultrasonic measurements is the same as that previously found by the dielectric spectroscopy in the same temperature region. (C) 2001 American Institute of Physics.