Physical Properties of a New Type of Molten Electrolytes, FeCl3-DMSO2

Abstract

Some physical properties of ferric chloride-dimethyl sulfone (FeCl3-DMSO2) melts were investigated. The phase diagram was determined by differential scanning calorimeter and thermogravimetric analyzer. The electric conductivity, measured with computerized direct-current method, increased with increasing temperature and DMSO2 content. The conductivity was maximal (0.02149 S/cm) at 115 °C for 30 mol% FeCl3. The densities of all melts decreased with increasing temperature and DMSO2 content. The equivalent conductivities were given by Λ = κMmix/ρ, where Mmix is the mean equivalent weight of the binary melts. These equivalent conductivities were fitted by the equationΛ =Λoexp(−EΛ /RT), where the activation energies EΛ were 8.63, 22.94, 25.92 kJ/mol for 30, 40, 50 mol% FeCl3, respectively.