Termochemistry and fluorinating ability of cerium tetrafluoride

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Abstract

Experimental data on the thermal stability and fluorinating ability of cerium(IV) fluoride are critically reviewed. From experiments on the joint fluorination of CeF3k and platinum, the value ΔfH°(CeF4, k, 298 K) = –1939.9±7.6 kJ/mol was determined. The most reliable value of the enthalpy of sublimation of cerium tetrafluoride ΔsH°(CeF4, 298 K) = 270.2±1.7 was selected and ΔfH°(CeF4, g, 298 K) = –1669.6±7.8 kJ/mol was calculated. A comparison of CeF4(k) with other solid-phase fluorinating agents was carried out.

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M. I. Nikitin

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Author for correspondence.
Email: alikhan@igic.ras.ru
Russian Federation, Moscow, 119991

D. B. Kayumova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: alikhan@igic.ras.ru
Russian Federation, Moscow, 119991

A. S. Alikhanyan

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: alikhan@igic.ras.ru
Russian Federation, Moscow, 119991

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2. Fig. 1. Adapted approximate phase diagram of CeF4–CeF3 [22], where  are the points obtained as a result of thermal analysis;  are the points obtained by differential thermal analysis; x are the quenched compositions; //// is the region in which it is impossible to describe the behavior of the system depending on temperature.

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3. Fig. 2. Dependence of the equilibrium constant of reaction (6) on the reciprocal temperature. The points marked with X were not used in the calculations.

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