Thermal Conductivity, Heat Capacity and Phase Diagrams of the Trichloroethanes Under Pressure

Abstract

The thermal conductivity λ the heat capacity per unit volume ρc_p, and the phase diagram of 1,1,1-trichloroethane have been investigated in the temperature range 115 to 350 K and at pressures up to 2 GPa. The Transient hot-wire method was used for the simultaneous measurement of λ and ρc_p. Of the stable phases only Ib and II were detected, and not phases III anf IV which had been reported in our range of measurement by some previous investigators. Furthermore, metastable phase Ia was roughly proportional to temperature. Such behaviour is consistent with regarding phase Ib as a plastic crystal phase and phase II as a normal crystal phase, which is in agreement with other work.