EFFECTS OF PRESSURE ON DIELECTRIC-RELAXATION IN SUPERCOOLED TRIPHENYLCHLOROMETHANE-ORTHO-TERPHENYL SOLUTION

Dielectric measurements have been made as a function of frequency, temperature, and pressure on a binary mixture of triphenylchloromethane and o-terphenyl in its supercooled liquid region. Since the distribution of relaxation time is independent of temperature and pressure in the present experimental range, the time-temperature-pressure superposition is accurately applied. The activation parameters such as the activation enthalpy at constant pressure, H*//P, the activation enthalpy at constant volume, H*//V, and the activation volume V* are obtained as a function of temperature and pressure.