Abstract

The Gibbs energy of formation of IrO 2(s) has been measured by means of oxygen dissociation pressure measurements, and by EMF measurements using ZrO 2 (+ CaO) as the solid electrolyte. In addition, high-temperature enthalpy increments of IrO 2 have ben measured from 416 to 940 K using a drop calorimeter. A “third law” evaluation of the experimental results and data from literature has been made. For the enthalpy of formation of IrO 2(s) the value Δ H° f (298.15 K) - −(59.60 ± 0.03) kcal mole −1 has been selected. The thermodynamic functions of IrO 2(s) have been calculated in the temperature range 298–1200 K.

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