Thermodynamic properties of the molten thallium + tellurium system

Abstract

The thermodynamic properties of molten Tl + Te alloys have been determined by the e.m.f. method. The observed integral entropy of mixing becomes practically zero and enthalpy shows a minimum at the stoichiometric composition Tl₂Te. The excess stability also exhibits a strong tendency to compound formation at this composition. It is concluded from these observations, together with those of the electrical properties,^1–5 that the molten Tl + Te system can be treated as two pseudo-binary systems, Tl + Tl₂Te and Tl₂Te + Te, and that around the stoichiometric composition Tl₂Te a high local ordering can be considered because of the ionic character of the chemical bonding.