A study of the various properties of liquid PbS, PbSe and PbTe is presented discussing the various possible models in the light of the semiconducting properties of these liquids. The electrical conductivity studies lead one to believe that the temperature dependence of electrical conductivity for these liquids is in accord with earlier reported studies of the temperature dependence of the energy gap for crystalline PbS, PbSe and PbTe. An interpretation is also given for sigma //0, and discussion of the Hall coefficient and the Hall mobility is presented. The next part of the presentation deals with thermal conductivity, thermoelectric power and other related properties. The negative values of the thermoelectric power for these liquids are qualitatively analyzed. Studies of the magnetic susceptibility for crystalline and liquid PbTe indicate that the ratio of the transition term to the energy gap is a constant at all temperatures so that the Van-Vleck component is temperature independent, thereby explaining the constancy of the total susceptibility. Electronegativity and ionicity studies are presented together with studies of the density, viscosity and other physio-chemical properties.
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