Investigation of vaporization behavior of hyper-stoichiometric uranium dioxide by Knudsen effusion mass spectrometry

Nakajima, Kunihisa ; Arai, Yasuo

The Knudsen effusion mass-spectrometric measurement of pure UO $_{2+x}$ (s) are carried out at 1673, 1773 and 1873K to evaluate G $_{f}$ $^{circ}$ (UO $_{3}$ ,g) as well as to measure the partial pressures of UO $_{3}$ (g) and O $_{2}$ (g) over UO $_{2+x}$ (s) as function of the O/U ratio. It was found that the partial pressures of O $_{2}$ (g) over UO $_{2+x}$ (s) almost agree with the experimental data reported in the past and the values derived from the empirical equation given by Nakamura and Fujino. Further, it was found that the values of G $_{f}$ $^{circ}$ (UO $_{3}$ ,g) obtained in this study are in good agreement with the recommended values.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	317
Number	:	2-3
Pages	:	p.243 - 251
Publication Year/Month	:	2003/05
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Paper URL	:	https://doi.org/10.1016/S0022-3115(03)00111-9
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Keywords	:	Uranium Dioxide; Uranium Trioxide; Oxygen Potential; Mass-spectrometry; Knudsen-cell
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Registration No. : A20020333
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