Semiconduction in the liquid Tl-SbTlX3 system (X:Te,Se)

The electrical conductivity, the magnetic susceptibility, and the thermoelectric power of the liquid Tl-SbTlTe3 and Tl-SbTlSe3 systems have been obtained as a function of temperature and composition from near the liquidus temperature up to about 1200 K. The telluride system exhibits a sharp minimum in electrical conductivity and a maximum in diamagnetic susceptibility around the composition of 80 mol% Tl. On the other hand, in the selenide system the conductivity changes little up to 66.7 mol% Tl(SbTl3Se3), and it rapidly increases with increasing Tl content above that stoichiometric composition. The thermoelectric power of both systems shows a change in sign around the respective compositions. The electronic properties of these liquid systems are discussed in the light of current transport theories employed in the amorphous and liquid semiconductors. (orig.)