Thermodynamic Properties of RuTe2 Evaluated by EMF Measurements on a Solid State Electrochemical Cell

Abstract

The thermodynamic properties of RuTe₂ have been determined for the first time using electromotive force (emf) measurements in the Ag–Ru–Te system. The thermodynamic properties have been evaluated from the temperature dependence of the emf measured on an all-solid electrochemical cell with a common gas space, corresponding to the virtual chemical reaction 4Ag + RuTe₂ = 2Ag₂Te + Ru. The measurements have been performed in the temperature range 747–884 K. As a result, the following standard thermodynamic properties of formation of RuTe₂ from its constituent elements at 298.15 K and 1 bar (10⁵ Pa) are recommended: Δ_fG° = –126.9 kJ/mol, S° = 94.94 J/(mol K), and Δ_fH° = –136.6 kJ/mol. The thermodynamic properties of RuTe₂ are compared to literature data for compounds isostructural with it: ruthenium disulfide and ruthenium diselenide.