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Title: Study of CeI{sub 3} evaporation in the presence of group 13 metal-iodides

The influences of GaI{sub 3}, InI, and TlI on the evaporation characteristics of CeI{sub 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{sub 3}. This is the highest temperature range for which measurements of the vapor pressure of CeI{sub 3} have been made. The vapor pressure of the CeI{sub 3} monomer above the pure CeI{sub 3} salt for temperatures exceeding its melting point can be approximated by log{sub 10}p/Pa=11.24(±0.03)−10,690(±40) (T/K){sup −1} where the numbers in parentheses are standard uncertainties. InI and TlI were shown to modestly enhance the presence of Ce in the vapor phase, up to a factor of 5. GaI{sub 3} produced no enhancement in this temperature range. Numerical simulations of the thermochemical equilibrium suggest the importance of both liquid-phase and vapor-phase complexes. Significant improvement to the method of absolute calibration is discussed.
Authors:
; ; ;  [1] ; ;  [2] ;  [3]
  1. National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899 (United States)
  2. OSRAM SYLVANIA Inc., 71 Cherry Hill Drive, Beverly, Massachusetts 01915 (United States)
  3. Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22275707
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 3; Other Information: (c) 2014 U.S. Government; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CERIUM IODIDES; COMPUTERIZED SIMULATION; EVAPORATION; FLUORESCENCE SPECTROSCOPY; MELTING POINTS; MONOMERS; SALTS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 1000-4000 K; VAPOR PRESSURE; VAPORS; X RADIATION