The quasi-critical behaviour of electric conductivity in glass-forming liquids

Results are presented of temperature studies of electric conductivity, for a few frequencies from 100 Hz to 100 kHz, in liquid glass-formers: dibutyl phthalate, glycerol and salol. It has been shown that the analysis of exper imental data similar to that applied in non-critical liquid mixtures of lim ited miscibility may offer a relatively precise and simple estimation of th e mode-coupling critical temperature (T-C) and exponent (gamma). Preliminar y pressure studies point to the possibility of isomorphic behaviour for the temperature and the pressure paths approaching the mode-coupling critical point.