Measurements of the electrical conductivity, magnetic susceptibility and thermoelectric power have been carried out on liquid Ag-As2Te3 and Ag-As2Te3 systems. The liquid Ag-As2Te3 system exhibits a deep minimum of the electrical conductivity, diamagnetic peak of the magnetic susceptibility and rapid drop of the positive thermoelectric power at the stoichiometric composition of Ag6As2Te3, reflecting the occurrence of the metal-semiconductor transition. The liquid Ag6As2Te3 system also has the diamagnetic peak of magnetic susceptibility and sign reversion of thermoelectric power near the composition of Ag6As2Te3. However, the electrical conductivity in the selenide system indicates a negative temperature dependence like metals and takes a maximum value at this composition. The observed results have been discussed with the help of the pseudogap model developed by Enderby and Barnes. In this result, the unusual behavior of electrical conductivity in the selenide system has been deduced to be associated with the conduction and valence band edge-parameters rather than the pseudogap width.
|Number of pages||7|
|Journal||Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics|
|Publication status||Published - Dec 1 1998|
- Chemical bond
- Electrical properties
ASJC Scopus subject areas
- Chemical Engineering(all)