Oxidation of UO2 containing small additions of other oxides

Landspersky, H.; Vobořil, M.

doi:10.1016/0022-1902(67)80166-0

Cited by 12 publications

(3 citation statements)

References 6 publications

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“…Nevertheless, the effect of lanthanides dopants on the oxidation of UO 2 still presents open question calling for further research . It is known that there are significant differences in air oxidation behavior between unirradiated and spent UO 2 fuel .…”

Section: Introductionmentioning

confidence: 99%

“…The crystal chemistry of this solid solution, could be described as (U 4+ (1ÀxÀy) ,U 5+ (x) ,La 3+ (y) )(O (2+x/2Ày/2) ) with the special cases ( Nevertheless, the effect of lanthanides dopants on the oxidation of UO 2 still presents open question calling for further research. [10][11][12][13][14] It is known that there are significant differences in air oxidation behavior between unirradiated and spent UO 2 fuel. 15 Choi et al 13 suggested that dissolved fission products can modify the oxidation kinetics of the spent fuel.…”

Section: Introductionmentioning

confidence: 99%

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Raman and X‐ray Studies of Uranium–Lanthanum‐Mixed Oxides Before and After Air Oxidation

et al. 2015

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UO 2 samples doped with 6, 11, 22 mol% lanthanum were examined before and after air oxidation. To verify the formation of uranium-lanthanum-mixed oxide solid solutions, powder X-ray diffraction (XRD) analyses of the crystalline phases in the materials were carried out. The presence of oxygen vacancies in the La-doped UO 2 samples was identified by Raman spectrometry. It was evidenced by changes induced in the Raman spectra by air oxidation. This latter was carried out either by increasing the Raman laser power or by thermally treating the samples at 500 K for 370 h. In addition, oxidation behavior differences of pure and La-doped UO 2 samples were reported by comparing XRD and Raman results of the samples before and after air oxidation. It was shown that the concentration of the M 4 O 9 (M: U, La) phase increased with increasing content of La, whereas inhibition for the formation of M 3 O 8 phase was observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Raman and X‐ray Studies of Uranium–Lanthanum‐Mixed Oxides Before and After Air Oxidation

et al. 2015

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“…Usually the velocity of a spontaneous decomposition depends on nucleus formation and crystal growth which follow an induction time [ll, 12] as observed in this case too. According to investigations of several authors the oxidation of U O2 to U~SL..-_ very fast at 390°C [13][14][15]. This explains the absence of U0 2 in the X-ray diagrams.…”

Section: +-----T----t---------------------------- 440'c 100 T~----d"mentioning

confidence: 98%