Vaporization and deposition of cesium dimolybdate,Cs2Mo2O7 |
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Authors: | Thi-Mai-Dung Do Supamard Sujatanond Yu Tachibana Toru Ogawa |
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Affiliation: | 1. Department of Nuclear System Safety Engineering, Nagaoka University of Technology, Nagaoka, Japan;2. Department of Industrial Engineering, Thammasat University, Khlongluang, Thailand;3. Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency, Naka-gun, Japan |
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Abstract: | Vaporization and deposition of cesium dimolybdate (Cs2Mo2O7) in argon were studied by thermogravimetry and transpiration methods. From Raman spectra and electron probe microanalysis of deposits and inductively coupled plasma mass spectroscopy of the aqueous trap of the exhaust, it was judged that the Cs2Mo2O7 vaporizes as Cs2Mo2O7 (g). The effect of water addition on Raman spectral of Cs2Mo2O7 was also investigated. Comparing the high-temperature mass losses of Cs2Mo2O7 by thermogravimetry with that of Cs2MoO4, the equilibrium vapor pressure of Cs2Mo2O7 was estimated. The vapor pressure of Cs2Mo2O7 (l) in its liquid state was calculated to be: log10P (Cs2Mo2O7)(l) = (8.95 ± 0.07) ? (1.03 ± 0.01) × 104 /T (T = 1273?1573 K). The enthalpy of vaporization of Cs2Mo2O7 (l) was estimated to be 197 ± 31 kJ·mol?1. |
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Keywords: | Cesium dimolybdate cesium molybdate enthalpy vaporization deposition Raman severe accident |
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