Characterization of PuO/PuCO-Type Phase and its Influence on the Oxidation Kinetics of delta-Plutonium

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TitreCharacterization of PuO/PuCO-Type Phase and its Influence on the Oxidation Kinetics of delta-Plutonium
Type de publicationJournal Article
Year of Publication2021
AuteursFavart N., Ravat B., Jolly L., Oudot B., Berlu L., Delaunay F., Popa I., Chevalier S.
JournalOXIDATION OF METALS
Volume96
Pagination271-281
Date PublishedOCT
Type of ArticleArticle
ISSN0030-770X
Mots-clésdelta -Plutonium, High temperature oxidation, XPS, XRD
Résumé

This work focuses on PuCO-type phase formation at the surface of delta-Pu at temperatures above 300 degrees C under low oxygen partial pressure. Its growth was characterised by XRD and XPS and was found to follow parabolic kinetics law. This oxycarbide formation was thermodynamically supported by CALPHAD calculations. XPS investigations of PuCO phase reveal a singular plutonium oxidation state never observed in plutonium oxides (i.e. PuO2 or Pu2O3). Furthermore, the oxycarbide presence on the sample surface strongly impacts the oxidation rate in oxygen atmosphere, reducing drastically the other oxide growth.
DOI10.1007/s11085-021-10067-2