Nikitin, M. I.
Alikhanyan, A. S.
Article History
Received: 6 April 2022
Revised: 18 May 2022
Accepted: 27 May 2022
First Online: 25 October 2022
CONFLICT OF INTEREST
: The authors declare no conflicts of interest.
: The thermodynamic functions of gaseous iridium(IV, VI) fluorides are tabulated in [CitationRef removed], but in the present work, the statistical weight of the ground electronic state <i>g</i><sub>0</sub> for IrF<sub>4</sub> is replaced by 4, for IrF<sub>6</sub> by 6, and for PtF<sub>4</sub> by 10. Φ°(IrF<sub>5</sub>(g), <i>T</i>) is taken the same as for RuF<sub>5</sub> [CitationRef removed] with <i>g</i><sub>0</sub> replaced by 5 and a correction for the mass ratio of these molecules is applied.For crystalline fluorides IrF<sub>4</sub> and Ir<sub>2</sub>F<sub>6</sub>, estimates were made, as in [CitationRef removed, CitationRef removed], for the corresponding platinum fluorides. The presented thermodynamic potential of crystalline iridium tetrafluoride Φ°(IrF<sub>4</sub>(c), <i>T</i>) and its temperature dependence are taken to be similar for ZrF<sub>4</sub>(c) [CitationRef removed], with allowance for the difference in the Latimer contributions for Zr and Ir (added 13 J/(mol K)). Φ°(Ir<sub>2</sub>F<sub>6</sub>(c), <i>T</i>) and its temperature dependence are taken to be the same as for GaF<sub>3</sub>(c) [CitationRef removed], with allowance for the difference between the Latimer contributions for Ga and Ir (added 16.7 J/(mol K)), and Ф°(Ir<sub>2</sub>F<sub>6</sub>(c), <i>T</i>) = 2[Ф°(GaF<sub>3</sub>(c), <i>T</i>) + 16.7].For metallic iridium and platinum, the data were taken from [CitationRef removed].