Application of Dielectric Spectroscopy for Investigation of Crystallization Kinetics of Supercooled Liquids at Elevated Pressure

In order to study the effect of compression on crystallization kinetics of supercooled liquids one can employ high pressure dielectric spectroscopy. In dielectric measurements progress of crystallization is manifested by decreasing of static permittivity. Analyzing time evolution of static permittivity during crystallization it is possible to determine the overall crystallization rate constant. Here we will present a new approach to study crystallization phenomena by maintaining the isochronal conditions during crystallization kinetics measurements. It means that dielectric studies of crystallization kinetics are performed at different temperature and pressure combinations but all the time keeping the same value of the structural relaxation time. As it will be demonstrated the main advantage of such approach is that one can untangle thermodynamic effects on crystallization from kinetics ones. Experimental results will be discussed within the formalism provided by Gutzow and co-workers.