Thermodynamic properties of dimeric molecules of lanthanum and lanthanide trichlorides Ln2Cl6(gas) |
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Authors: | A D Chervonnyi N A Chervonnaya |
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Institution: | (1) Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia |
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Abstract: | The partial pressures of dimeric molecules Ln2Cl6 in the saturated vapor over lanthanum and lanthanide trichlorides LnCl3 (Ln = La, ..., Nd, Sm, Gd, ..., Lu) have been determined by high-temperature mass spectrometry. From these data, the enthalpies of the gas-phase reaction Ln2Cl6 = 2LnCl3 and the enthalpies of sublimation of the compounds under consideration in the form of Ln2Cl6 dimers have been calculated by the third law. Analogous characteristics have also been calculated by the second and third laws from the available literature data on the partial pressures of Ln2Cl6 in the course of sublimation (evaporation) of LnCl3. Taking into account typical tendencies in the standard thermodynamic characteristics of lanthanum and lanthanide compounds, a set of recommended D 298 0 (LnCl3-LnCl3) values has been determined. This set has been used for calculating the enthalpies of atomization Δat H 298 0 (Ln2Cl6), where Ln = La, ..., Lu. |
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