Electronic and ionic conductions in liquid Cu-Se system

Electronic and ionic conductivities of liquid Cu-Se system have been measured as a function of concentration and temperature. The electronic conductivity: sigma(e), in the system shows a broad minimum near the composition Cu2Se and the ionic conductivity, sigma(i), has a maximum around this composition. In Se-rich region, a change from negative to positive temperature dependence of sigma(i) and a discontinuous jump in ai have been observed at a certain temperature. The relation between the electronic and ionic conductivities have quantitatively been discussed.