Thermodynamic properties of the selenium-tellurium system

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Abstract
An inhomogeneous structure model is applied to the Se-Te system to account for the observed relationship between the isothermal compressibility and the thermal expansion coefficient as functions of composition. The phenomena can be consistently explained in terms of changes with composition, temperature and pressure, in the fractions of two kinds of domains present: one metallic, the other non-metallic. The overall consistency obtained for the thermodynamic and electrical properties suggests that groups of 20-30 atoms simultaneously take part in the structural changes. It is concluded that heterogeneous electrical transport occurs and that the non-metal-metal transition occurs at a percolation threshold.