Thermodynamic Properties of Terbium Tellurides

Abstract

The paper presents the results of a study of solid-phase equilibria in the Tb–Te system and the thermodynamic properties of terbium tellurides obtained by the methods of electromotive forces and X-ray diffraction analysis. Based on the experimental data, it was established that the TbTe, Tb₂Te₃, TbTe₂ и TbTe₃ compounds are formed in the system. For the investigations of the alloys from the two-phase regions TbTe₃+Te, TbTe₂+TbTe₃, and Tb₂Te₃+TbTe₂, the EMF of concentration cells relative to the TbTe electrode was measured. The EMF of concentration cells relative to the terbium electrode was measured for the TbTe+Tb₂T₃ region. The partial thermodynamic functions of TbTe and Tb in alloys were determined by
combining the EMF measurements of both types in the 300–450 K temperature range, based on which the standard thermodynamic functions of formation and standard entropies of the indicated terbium tellurides were calculated.

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