Chemical thermodynamics of RuO2(s)

Thermodynamic data for the ruthenium oxide RuO2(s) are basic data for the calculation of gaseous release in the case of severe nuclear accident. The present study is a critical analysis of thermochemical data for RuO2(s) based on available published experimental data from calorimetry, vapor pressures in equilibrium with the diphasic RuRuO2 and Electromotive Force Measurements EMF. A full critical review and reinterpretation of data are presented in this work with a proposition of new and accurate data for RuO2(s): C°p (RuO2, s, 298.15 K) = 56.42 ± 0.08 J·K-1 ·mol-1, S°298.15 (RuO2,s) = 46.15 ± 0.05 J·K-1 ·mol-1, and Δ; fH298 (RuO2,s) = −312.3 ± 1.6 kJ.mol-1,