Enhancement of lanthanide evaporation by complexation: Dysprosium tri-iodide mixed with indium iodide and thulium tri-iodide mixed with thallium iodide

J. J. Curry, E. G. Estupiñán, A. Henins, W. P. Lapatovich, S. D. Shastri, J. E. Hardis
2013 Journal of Chemical Physics  
The vapors in equilibrium with condensates of DyI 3 , DyI 3 /InI, TmI 3 , and TmI 3 /TlI were observed over the temperature range from 900 K to 1400 K using x-ray induced fluorescence. The total densities of each element (Dy, Tm, In, Tl, and I) in the vapor, summed over all atomic and molecular species, were determined. Dramatic enhancements in the total vapor densities of Dy and Tm were observed in the vapors over DyI 3 /InI and TmI 3 /TlI as compared to the vapors over pure DyI 3 and pure TmI
more » ... 3 , respectively. An enhancement factor exceeding 10 was observed for Dy at T ≈ 1020 K, decreasing to 0 at T ≈ 1250 K. An enhancement factor exceeding 20 was observed for Tm at T ≈ 1040 K, decreasing to 0 at T ≈ 1300 K. Such enhancements are expected from the formation of the vapor-phase hetero-complexes DyInI 4 and TmTlI 4 . Numerical simulations of the thermochemical equilibrium suggest the importance of additional complexes in liquid phases. A description of the measurement technique is given. Improvements in the absolute calibration lead to an approximately 40% correction to previously reported preliminary results [J. J. Curry et al., Chem.
doi:10.1063/1.4821828 pmid:24089770 fatcat:tfelfozsqrgktcyattt2wmiywu