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: Δ_fH°(CrF, g, 0) = –42.5 ± 15.1 kJ/mol, Δ_fH°(CrF₂, cr, 298.15 K) = –780.7 ± 2.5 kJ/mol, Δ_fH°(CrF₂, g, 0) = –454.7 ± 4.6 kJ/mol, Δ_fH°(CrF₃, cr, 298.15 K) = –1146.7 ± 4.2 kJ/mol, and Δ_fH°(CrF₃, g, 0) = –799.9 ± 12.1 kJ/mol. The possibility of formation of crystalline Cr₂F₅ upon reduction of CrF₃(cr) was confirmed.

中文翻译：

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氟化铬的生成焓 I. 低氟化物 CrF、CrF2 和 CrF3

摘要

对一组实验数据进行了详细分析，包括在最近的出版物中给出的，关于涉及低氟化铬的反应的气相和非均相平衡。考虑了在各种研究中获得的化合物的相同热力学特性之间存在差异的原因。分析结果表示为结晶和气态化合物的校正形成焓：Δ _f H °(CrF, g, 0) = –42.5 ± 15.1 kJ/mol, Δ _f H °(CrF ₂ , cr, 298.15 K ) = –780.7 ± 2.5 kJ/mol, Δ _f H °(CrF ₂ , g, 0) = –454.7 ± 4.6 kJ/mol, Δ _f H °(CrF ₃, cr, 298.15 K) = –1146.7 ± 4.2 kJ/mol，并且 Δ _f H °(CrF ₃ , g, 0) = –799.9 ± 12.1 kJ/mol。确认了在还原CrF ₃ (cr)时形成结晶Cr ₂ F ₅的可能性。