Affiliation:
1. Research Institute of Thermodynamics and Kinetics, Ivanovo State University of Chemistry and Technology, Ivanovo 153000, Russia
2. Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland
Abstract
The molecular and ionic composition of vapor over cerium triiodide was studied by Knudsen effusion mass spectrometry. In the saturated vapor over CeI3the monomer, dimer, and trimer molecules and the negative ions I−,CeI4-, andCe2I7-were identified in the temperature range of 753–994 K. The partial pressures of CeI3, Ce2I6, and Ce3I9were determined and the enthalpies of sublimation,ΔsH°(298.15 K) in kJ·mol−1, in the form of monomers (298±9), dimers (415±30), and trimers (423±50) were obtained by the second and third laws of thermodynamics. The enthalpy of formation,ΔfH°(298.15 K) in kJ·mol−1, of the CeI3(-371±9), Ce2I6(-924±30), and Ce3I9(-1585±50) molecules and theCeI4-(-857±19) andCe2I7-(-1451±50) ions were calculated. The electron work function,φe=3.3±0.3 eV, for the CeI3crystal was evaluated.
Funder
Ministry of Education and Science of the Russian Federation
Subject
Spectroscopy,Atomic and Molecular Physics, and Optics,Analytical Chemistry
Cited by
8 articles.
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