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Enthalpies of Formation of Chromium Fluorides I. Lower Fluorides CrF, CrF2, and CrF3

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Abstract

Detailed analysis is carried out for the set of experimental data, including those given in most recent publications, on the gas-phase and heterogeneous equilibria of reactions involving lower chromium fluorides. The causes for discrepancies between the same thermodynamic characteristics of compounds obtained in various studies are considered. The results of the analysis are presented as corrected enthalpies of formation of crystalline and gaseous compounds: ΔfH°(CrF, g, 0) = –42.5 ± 15.1 kJ/mol, ΔfH°(CrF2, cr, 298.15 K) = –780.7 ± 2.5 kJ/mol, ΔfH°(CrF2, g, 0) = –454.7 ± 4.6 kJ/mol, ΔfH°(CrF3, cr, 298.15 K) = –1146.7 ± 4.2 kJ/mol, and ΔfH°(CrF3, g, 0) = –799.9 ± 12.1 kJ/mol. The possibility of formation of crystalline Cr2F5 upon reduction of CrF3(cr) was confirmed.

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Funding

This study was carried out within the State Assignment to the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, in the field of basic research.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    M. I. Nikitin, I. P. Malkerova, D. B. Kayumova & A. S. Alikhanyan

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  1. M. I. Nikitin
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  2. I. P. Malkerova
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  3. D. B. Kayumova
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  4. A. S. Alikhanyan
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Correspondence to A. S. Alikhanyan.

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Translated by Z. Svitanko

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Nikitin, M.I., Malkerova, I.P., Kayumova, D.B. et al. Enthalpies of Formation of Chromium Fluorides I. Lower Fluorides CrF, CrF2, and CrF3 . Russ. J. Inorg. Chem. 66, 1011–1016 (2021). https://doi.org/10.1134/S0036023621070093

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