抄録
Measurements of the electrical conductivity, magnetic susceptibility and thermoelectric power of liquid Tl–TlInTe2 and In–TlInTe2 systems have been carried out over wide temperature and composition ranges. The composition dependence of the electronic properties investigated exhibits that there is a rapid increase in both electrical conductivity and paramagnetic contribution in the metal-rich region above 66.7 mol% of Tl and In corresponding to the stoichiometric compositions of Tl3InTe2 and TlIn3Te2. In addition, a change in the sign of the thermoelectric power occurs at these compositions in both systems. The observed electronic properties are discussed in terms of the delocalized model of electrons, i.e., the diffusive transport theory and the model which includes the metallic approximation. The results show that the nonmetallic contribution is pronounced in the Tl–TlInTe2 system compared with the In–TlInTe2 system. Consequently, the anomalous behavior of the electronic properties observed around 66.7 mol% of Tl and In in the present systems is considered to be caused by the nonmetallic nature of Tl(I)–Te bonds.
