JOPSS - Search Results

Search Results: Records 1-5 displayed on this page of 5

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Journal Articles

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

Nakajima, Kunihisa; Arai, Yasuo

Journal of Nuclear Materials, 317(2-3), p.243 - 251, 2003/05

https://doi.org/10.1016/S0022-3115(03)00111-9

Times Cited Count：3 Percentile：25.79(Materials Science, Multidisciplinary)

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.

Journal Articles

Mass-spectrometric determination of oxygen potential of hypostoichiometric urania-yttria solid solution

Nakajima, Kunihisa; Omichi, Toshihiko*; Arai, Yasuo

Journal of Nuclear Materials, 304(2-3), p.176 - 181, 2002/08

https://doi.org/10.1016/S0022-3115(02)00876-0

Times Cited Count：3 Percentile：23.41(Materials Science, Multidisciplinary)

The oxygen potentials of two type urania-yttria solid solutions, one is the solid solution expressed as nearly U $_{1-y}$ Y $_{y}$ O $_{2-y/2}$ and the other is nearly stoichiometric solid solution, are investigated by use of a mass spectrometer combined with a Knudsen cell. The oxygen potentials for the nearly stoichiometric specimens are much higher than those for pure urania with similar stoichiometry. On the other hand, the oxygen potentials for fully reduced specimens almost agree with those for pure urania having the same oxygen deficiencis.