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Thermodynamic Properties of Lanthanum Chlorides

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Abstract

The enthalpies of atomization of LaCl, LaCl2, and LaCl3 are determined by measuring the vapor pressure over liquid and solid LaCl3 and assessing the equilibrium constants of the gas-phase reactions BaCl + La = Ba + LaCl and 2BaCl + La = 2Ba + LaCl2, using the appearance potentials of ions and the ionization potentials of the lanthanum chlorides: Δat H 0(LaCl, 298 K) = 502.4 ± 0.5 kJ/mol, Δat H 0(LaCl2, 298 K) = 999.2 ± 0.8 kJ/mol, and Δat H 0(LaCl3, 298 K) = 1524.6 ± 2.0 kJ/mol. In addition, the enthalpies of formation of gaseous lanthanum chlorides are determined using new data on the thermodynamic functions of condensed LaCl3 and gaseous LaCl, LaCl2, and LaCl3: Δf H 0(LaCl, g, 298 K) = 48.9 ± 1.0 kJ/mol, Δf H 0(LaCl2, g, 298 K) = –326.6 ± 1.2 kJ/mol, and Δf H 0(LaCl3, g, 298 K) = –730.7 ± 2.0 kJ/mol. The ionization and appearance potentials of ions resulting from electron impact ionization of LaCl3 are determined.

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  1. Institute of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    A. D. Chervonnyi & N. A. Chervonnaya

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  1. A. D. Chervonnyi
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Chervonnyi, A.D., Chervonnaya, N.A. Thermodynamic Properties of Lanthanum Chlorides. Inorganic Materials 40, 1097–1104 (2004). https://doi.org/10.1023/B:INMA.0000046477.94113.af

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