Title: Thermochemical studies of the gaseous lower-valent fluorides of molybdenum
Abstract:Equilibria among the gaseous molybdenum fluorides were studied by high temperature mass spectrometry, and the results were used to derive thermochemical heats of formation and bond dissociation energi...Equilibria among the gaseous molybdenum fluorides were studied by high temperature mass spectrometry, and the results were used to derive thermochemical heats of formation and bond dissociation energies for the gaseous species MoF, MoF2, MoF3, MoF4, and MoF5. Effusion beams containing the gaseous fluorides were generated by the reaction of SF6 or MoF6 with elemental Mo at temperatures of 1100–2200 K, and the thermochemical results were derived from a second-law analysis of the equilibrium data. Values of the standard heats of formation, ΔHf °298, obtained are as follows: for MoF, 65.0±2.2 kcal/mol; MoF2, −40.2±2.9 kcal/mol; MoF3, −141.5±3.5 kcal/mol; MoF4, −228.0±3.9 kcal/mol; and MoF5, −296.7±8.6 kcal/mol. The value for MoF yields the dissociation energy D00(MoF) =110.3±2.2 kcal/mol (4.78±0.10 eV). Estimated spectroscopic and molecular constants are consistent with the gaseous equilibrium data, indicating that assumptions about the derivation of equilibrium constants from ion currents are reasonable. ]Read More
Publication Year: 1976
Publication Date: 1976-07-15
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 27
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