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Investigations on Oxidation Behavior of Nanoscale FeAu and FeRh Alloys

This study examines the oxidation behavior of FeAu and FeRh nanoalloys at different voltages in the presence of O2 and H2. The effects of transient kinetics, size, and segregation of Rh are analyzed. The results suggest that FeAu nanoalloys at 500 V are less oxidized compared to those at 300 V, while the oxidation levels of Rh remain consistent. Additionally, FePt nanoalloys exhibit lower oxidizability attributed to the presence of Pt. Ongoing N-EXAFS analysis aims to provide further insights. Proposals for future research projects and collaborations are also discussed.

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Investigations on Oxidation Behavior of Nanoscale FeAu and FeRh Alloys

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  1. XPS sur FeX – Bessy 2011 + TEM après recuit à 250°C sous O2 et H2

  2. Fe 500 V (+O2 +H2) a-Fe2O3 ? As foil Fe ref a-Fe2O3

  3. FeAu 500 V (+O2 +H2) Fe3O4 Au non oxydé FeAu 300 V (+O2 +H2), Dcore~2.5 nm a-Fe2O3 Au non oxydé Fe dans les nanoalliages FeAu 500 V est moins oxydé que dans les FeAu 300 V. Au est inoxidable ? Effet cinétique transitoire (Spiros)? Effet de taille?

  4. FeRh 300 V (+O2 +H2), Dcore~2.5 nm a-Fe2O3 50 % Rh oxydé FeRh 500 V (+O2+H2) Fe + a-Fe2O3 50 % Rh oxydé Fe dans les nanoalliages FeRh 500 V est moins oxydé que dans les 300 V. Rh est autant oxydé ? Effet cinétique transitoire (Spiros)? Effet de taille et ségrégation du Rh?

  5. FePt 300 V (+O2 +H2), Dcore~2.3 nm Fe3O4 Pt non oxydé Les nanoalliages FePt 300 V ont l’air moins oxydables que les autres FeX, Effet du Pt ?

  6. Dépouillement N-EXAFS en cours (post-docs) … ex: FeRh 500 V (+O2 +H2) Fe3O 4 oug-Fe2O3 Fe + a-Fe2O3

  7. Dépouillement N-EXAFS en cours (post-docs) … Nuances à vérifier en TEY (Total electron Yield) mode Fe foil / Fe 500 V (+O2 +H2)

  8. Futur? • Proposal HP-XPS sur des Nanoalliages at MaxLab in Sweden. • Nanoalliages CoFe, ANR 2012 refusée, stage M2 ? • Sujet de thèse région ARC et/ou Labex I-must ? • Proposals ANR MATETPRO (dépôt 7 mars 2012)? Industriel ? • Qui veut faire quoi ?

  9. FePt 300 V (+O2 +H2), Dcore~2.3 nm FePt 300 V + C (as prepared), D~2.6 nm

  10. FeRh 300 V + C (as prepared) FeRh 300 V (+O2 +H2), Dcore~2.5 nm

  11. FeRh 300 V + C (as prepared) FeRh 500 V + C (as prepared)

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