ELECTRONIC-PROPERTIES OF MOLTEN CU-CUTLTE2 AND AG-AGTLTE2 SYSTEMS

Measurements of the electrical conductivity, magnetic susceptibility a nd thermoelectric power in liquid Cu-CuTlTe2 and Ag-AgTlTe2 systems ha ve been carried out over wide temperature and composition ranges. Thes e liquid systems exhibit the compound-forming behavior in the vicinity of stoichiometric compositions, Cu3TlTe2 and Ag3TlTe2, such as the co nductivity minimum, diamagnetic maximum and reverse in the sign of the thermoelectric power. Radial distribution analyses of the stoichiomet ric compositions, Cu3TlTe2 and Ag3TlTe2, by X-ray and neutron diffract ions indicate that the bonding nature of Cu-Te and Ag-Te in both alloy s is rather covalent, differing from the ionic nature of Tl-Te in liqu id Tl2Te which is well-known as a typical compound-forming liquid.