Oxygen potential of neodymium-doped U0.817Pu0.180Am0.003O2±x uranium–plutonium–americium mixed oxides at 1573, 1773, and 1873K

•First measurements of the oxygen potential of Nd-doped MOX.•Neodymium increases the oxygen potential of the MOX (for given t and O/M ratio).•A charge-compensation scenario is proposed for stoichiometric (O/M = 2) Nd-MOX.•Defect chemistry in deep hypostoichiometry changes when Nd content increases....

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Bibliographic Details
Published in:Journal of nuclear materials 2023-07, Vol.580, Article 154416
Main Authors: Vauchy, Romain, Sunaoshi, Takeo, Hirooka, Shun, Nakamichi, Shinya, Murakami, Tatsutoshi, Kato, Masato
Format: Article
Language:English
Subjects:
Actinides
MOX
Nuclear fuel
Oxygen potential
Oxygen/Metal ratio
Point defects
SIM fuel
TGA
Uranium–plutonium mixed oxide
XRD
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Summary:•First measurements of the oxygen potential of Nd-doped MOX.•Neodymium increases the oxygen potential of the MOX (for given t and O/M ratio).•A charge-compensation scenario is proposed for stoichiometric (O/M = 2) Nd-MOX.•Defect chemistry in deep hypostoichiometry changes when Nd content increases. Oxygen potentials of U0.817Pu0.180Am0.003O2±x incorporating 10 and 20 mol% of neodymium (Nd/Metal) were investigated by thermogravimetry at 1573, 1773, and 1873 K. The presence of neodymium induced an increase in the oxygen potential of the U–Pu mixed oxide. The correlation between oxygen partial pressure pO2 and deviation from stoichiometry x was analyzed, and a model of defect chemistry was proposed. Finally, the crystal structure of these mixed oxides was discussed at the light of the mechanisms of possible Nd(III)/U(V) charge compensation, and deviation from stoichiometry. [Display omitted]
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2023.154416