Impact of alpha-damage and helium production on the heat capacity of actinide oxides

The heat capacity of alpha-damaged uranium, plutonium, and americium mixed dioxide (U u , Pu v , Am w )O 2±x samples was measured during thermal annealing. The excess of heat released was assessed and the recovery stages associated with various defects described by integrating results from transmission electron microscopy, helium desorption spectroscopy, thermal diffusivity, and XRD annealing studies. It is shown that different defect-annealing stages could be singled out. It could also be evidenced that the excess of energy stored in defects tends to saturate after rather low damage levels, but that, with increasing radiogenic helium production, another contribution of stored energy appears which can be attributed to the formation of He-defect complexes that cannot be annihilated until higher temperatures are reached.

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Publication Details

Journal
Frontiers in Nuclear Engineering
Published
2025-02-24
DOI
https://doi.org/10.3389/fnuen.2025.1495360
Citations
3
Primary Topic
Nuclear Materials and Properties
Type
article
Field-Weighted Citation Impact
1.55
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article

Impact of alpha-damage and helium production on the heat capacity of actinide oxides

Dragos Staicu, Zeynep Talip, Gianguido Baldinozzi, V.V. Rondinella et al.
3 citations
Frontiers in Nuclear Engineering
Nuclear Materials and Properties
1.55
article

Impact of alpha-damage and helium production on the heat capacity of actinide oxides

Dragos Staicu, Zeynep Talip, Gianguido Baldinozzi, V.V. Rondinella, Christine Guéneau, Emanuele De Bona, R.J.M. Konings, Oliver Dieste Blanco, L. Cognini, Arne Janßen, Wiss Thierry, Alessandro Benedetti, Emilio Andrea Maugeri, Jean-Yves Colle
article en
3 citations

Abstract

The heat capacity of alpha-damaged uranium, plutonium, and americium mixed dioxide (U u , Pu v , Am w )O 2±x samples was measured during thermal annealing. The excess of heat released was assessed and the recovery stages associated with various defects described by integrating results from transmission electron microscopy, helium desorption spectroscopy, thermal diffusivity, and XRD annealing studies. It is shown that different defect-annealing stages could be singled out. It could also be evidenced that the excess of energy stored in defects tends to saturate after rather low damage levels, but that, with increasing radiogenic helium production, another contribution of stored energy appears which can be attributed to the formation of He-defect complexes that cannot be annihilated until higher temperatures are reached.

Frontiers in Nuclear EngineeringVol. 4
Centre National de la Recherche Scientifique (FR), Carl Zeiss (Germany) (DE), Eurostat (LU), University of Trento (IT), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), Directorate-General for Energy (BE), Paul Scherrer Institute (CH), CentraleSupélec (FR), Centre des Matériaux (FR), Institute of Condensed Matter Chemistry and Technologies for Energy (IT), CEA Paris-Saclay (FR), Joint Research Centre (DE), Laboratoire Structures, Propriétés et Modélisation des Solides (FR)
Affordable and clean energy
Openalex Percentile: Top 20%
Nuclear Materials and Properties
1.55
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