Abstract
The results of measurement of equilibrium constants of 30 reactions involving lanthanum and lanthanide fluorides (LnF, LnF2, and LnF3) and 14 reactions involving lanthanum and lanthanide monochlorides (Ln = La-Lu) have been summarized. These constants have been used for calculating the enthalpies of reactions by the second and third laws, from which the enthalpies of atomization ΔatH00 of LnCl, LnF, and LnF2 have been determined. Comparison of the calculation results shows that the thermodynamic functions of LnCl and LnF (Ln = Ce-Yb) in which the electronic excitation contribution has been calculated from the excitation energies of Ln+ ions allow one to adequately determined the ΔatH00 values from experimental data. Using the trends in the change in ΔatH00 as a function of the atomic number of a lanthanide, the enthalpies of atomization of compounds for which experimental data are lacking have been estimated. The ΔatH00 values for LnCl+ ions have been calculated. The reliability of the ΔatH00 values for LnF+ ions have been assessed.
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