Electrical conductivity and thermoelectric power of the molten Tl + Se and Tl + Te systems

The electrical conductivity and thermoelectric power of the liquid T1 + Se and T1 + Te systems have been measured as a function of concentration and temperature. Both of the systems show a deep minimum in the electrical conductivity at the composition corresponding to T12Se and T12Te. The absolute thermoelectric power changes its sign around this composition, being negative for the T1-rich solutions and positive for the Se- and Te-rich solutions. The impurity effect was examined in the T12Se melt. The electrical conductivity of the saturation range, where the carrier density can be considered to be constant, is discussed in the light of the scattering model.