ELECTRONIC-PROPERTIES OF THE LIQUID IN-AS2TE3 SYSTEM

The electrical conductivity, magnetic susceptibility and thermoelectri c power in the liquid In-As2Te3 system have been obtained as a functio n of temperature and composition. X-ray diffraction measurements for l iquid In2As2Te3 were carried out to investigate the bonding nature bet ween In and Te atoms. The system exhibits a sharp minimum of conductiv ity, rapid increase in diamagnetism and inversion of the sign of the t hermoelectric power around the composition of In2AS2Te3. However, thes e anomalies almost disappear at higher temperature. The distribution f unction obtained by the diffraction measurement suggests that the In-T e bonds are comparatively covalent, by contrast with the ionic Tl-Te b onds. This is also supported by the magnitude of the diamagnetic contr ibution in the system determined from conductivity and susceptibility data on the basis of a delocalized approximation for electrons.