Study of CeI3 evaporation in the presence of Group 13 metal-iodides

Published

January 17, 2014

Author(s)

John J. Curry, Albert Henins, E. G. Estupinan, S. D. Shastri, Jonathan E. Hardis, W. P. Lapatovich

Abstract

The influence of GaI$_3$, InI, and TlI on the evaporation characteristics of CeI$_3$ have been studied over the temperature range 900 K to 1400 K using x-ray induced fluorescence. The total vapor densities, summed over all atomic and molecular species, of Ce, I, In, and Tl were obtained. Measurements of Ce were limited to temperatures above 1033 K, the melting temperature of CeI$_3$. This is the highest temperature range for which measurements of the vapor pressure of CeI$_3$ have been made. The vapor pressure of pure CeI$_3$ above its melting point can be approximated by $\log_{10} p/{\rm Pa}=11.69(\pm 0.03)-11,060(\pm 30)\ T^{-1}$. InI and TlI were shown to modestly enhance the presence of Ce in the vapor phase, up to a factor of 3. GaI$_3$ produced no enhancement in this temperature range. Numerical simulations of the thermo-chemical equilibrium suggest the importance of both liquid-phase and vapor-phase complexes. Significant improvement to the method of absolute calibration is discussed.

Citation

Journal of Chemical Physics

Volume

115

Pub Type

Journals

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Keywords

cerium iodide, high-temperature, lighting, metal-halide, thermochemistry, vapor pressure, x-ray fluorescence

Citation

Curry, J. , Henins, A. , Estupinan, E. , Shastri, S. , Hardis, J. and Lapatovich, W. (2014), Study of CeI₃ evaporation in the presence of Group 13 metal-iodides, Journal of Chemical Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=914675 (Accessed October 27, 2025)