Abstract

Electrical conductivities of molten trimethylpentylammonium triethyloctylborate (N1115B2228) and triethylpentylammonium triethylpentylborate (N2225B2225) were measured as functions of temperature (c. 293 · 15–383 · 15 K) and pressure (from 1 bar to 5 kbar). Analysis of the temperature dependence of the electrical conductivity was made by using the Vogel–Tammann–Fulcher equation, &kgr; = Aexp[ – B/(T – T₀)]. The empirical nature of the pressure dependence of the B and T₀ parameters has revealed the possibility of obtaining an isothermal equation to explain the pressure dependence of the electrical conductivity. Accordingly, an empirical equation of the form &kgr; = a′exp(b′ P+c′ P²) has been found to describe the pressure dependence of the electrical conductivity. The ideal glass transition temperature, T₀, is the key parameter in controlling the pressure dependence of the electrical conductivity for both systems under study.