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Article

Thermophysical Properties of Materials
2020. V. 58. № 5. P. 694–698
Osina E.L., Gorokhov L.N., Osin S.B.
Thermodynamics of the evaporation of yttrium triiodide in the form of YI3 and Y2I6 molecules
Annotation
In this paper, we select the values of the molecular constants and calculate the thermodynamic functions of YI3 and Y2I6 based on a critical analysis of experimental and theoretical data on the structure and vibration frequencies of the monomeric and dimeric forms of yttrium triiodide molecules. Using the literature data on the ratio of the partial pressures of dimeric and monomeric molecules and the third law of thermodynamics, we determine the enthalpy of the YI3(cr., l)+YI3(g)=Y2I6(g) reaction and calculate the composition of the yttrium iodide vapor in the temperature range of 800961 K, for which there are literature data on the total pressure. In the considered temperature range, the Pd/Pm pressure ratio is found to increase from 0.003 to 0.014. The determined partial pressures are used to calculate the sublimation enthalpies of yttrium triiodide in the form of monomeric and dimeric molecules and the formation enthalpies of these molecules. The obtained values have been entered into the database of the IVTANTHERMO software package.
Article reference:
Osina E.L., Gorokhov L.N., Osin S.B. Thermodynamics of the evaporation of yttrium triiodide in the form of YI3 and Y2I6 molecules, High Temp., 2020. V. 58. № 5. P. 694