Thermodynamic and electrical properties of the liquid Se-Te system

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Abstract
An inhomogeneous structure model is applied to the liquid Se-Te system to explain its anomalous thermodynamic properties. The proposed model can consistently describe the thermodynamic processes in the system and thus provides evidence that a kind of structural phase transition occurs in the liquid. The temperature and pressure dependences of the conductivity have been analysed quantitatively taking into account the accompanying structural evolution. At low temperatures and pressures, the electrical transport is brought about predominantly by the localised states due to bond defects associated with the local structural change. The non-metal-metal transition occurs at a certain concentration of bond defects. The two activation energies of the conductivity can be explained in terms of a two-band model.

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