The behavior of fission product rare gases in change of solid phase. Oxidation and reduction of uranium oxides

Journal Article · Fri Sep 01 04:00:00 EDT 1961 · Nippon Genshiryoku Gakkai-Shi

DOI:https://doi.org/10.3327/jaesj.3.705· OSTI ID:4828739

Ichiba, S. ^[1]

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1. Japan Atomic Energy Research Inst., Tokyo (Japan)

The oxidation and reduction behaviors of uranium oxides were studied by the fission gas emanation method. Three peaks were found in the heating curve of oxidation of UO₂. The temperatures and ranges where the peaks appear-changed with the particle size. An x-ray diffraction method, thermal balance, and O/U measurement were used to identify the existing phases. The oxidation of UO₂ occurs at the first peak. A slightly oxygen-rich phase of U₃O₈ was observed in the second peak, followed by the third peak where slightly uranium-rich phase of U₃O₈ was observed. The reduction of U₃O₈ to UO₂ with hydrogen occurs at about 600°C. The mechanism of xenon release from the oxide crystals when the oxldation or reduction occurs was also studied.

• Research Organization: Japan Atomic Energy Research Inst., Tokyo (Japan)
• NSA Number: NSA-16-003001
• OSTI ID: 4828739
• Journal Information: Nippon Genshiryoku Gakkai-Shi, Journal Name: Nippon Genshiryoku Gakkai-Shi Journal Issue: 9 Vol. 3; ISSN 0004-7120
• Country of Publication: Japan
• Language: Japanese

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CRYSTALS
DEGASSING
DIAGRAMS
DIFFRACTION
EMANATION METHOD
FISSION PRODUCTS
GRAIN SIZE
HEATING
HIGH TEMPERATURE
HYDROGEN
OXIDATION
OXYGEN
PHASE DIAGRAMS
QUANTITY RATIO
RADAR
RARE GASES
REACTION KINETICS
REDUCTION
SOLIDS
TEMPERATURE
THERMAL EQUILIBRIUM
THERMODYNAMICS
U3O8
URANIUM
URANIUM DIOXIDE
URANIUM OXIDES
X RADIATION
XENON