On the isothermal pressure behaviour of the relaxation times for supercooled glass-forming liquids

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Abstract
This paper discusses the isothermal pressure behaviour of the relaxation times for supercooled glass-forming liquids. Analysis based on reference data and the authors' measurements of dielectric relaxation is carried out for both strong and fragile glass formers. All of the experimental relaxation times clearly exhibit a non-Arrhenius behaviour well reproduced by a function or , giving the same estimates of the ideal glass transition pressure . Experimental data indicate that fragile materials show a more rapid increase of the relaxation time with rise of pressure than the strong ones.