Abstract
The skutterudite materials belonging to the CoSb3 family are widely studied for thermoelectric applications. They are typically used under vacuum, but applications under oxidizing environments are increasingly considered. The addition of ytterbium is known to enhance the thermoelectric properties of CoSb3, but the corresponding impact on the oxidation behavior of the skutterudite material is barely explored. For that purpose, the present research describes the oxidation behavior of Yb0.2Co4Sb12 under a flow of air at 800 K for 15, 50, 100, and 1000 hours. The oxidation treatment induces the growth of a surface layer made of three oxides in various amounts as a function of the oxidation time. The spinel oxide CoSb2O4/CoO·Sb2O3 and CoSb2O6 are observed from 15 hours of oxidation, whereas Sb2O4 is formed only from 100 hours of treatment. To assess the impact of ytterbium, the oxidation behavior of Yb0.2Co4Sb12 is compared to that of CoSb3 oxidized in the same experimental conditions. The results show that the low amount of ytterbium promotes the oxidation reactions of the skutterudite material. Nonetheless, the impact on the degradation of the material remains acceptable to use Yb0.2Co4Sb12 for thermoelectric applications under oxidizing environments.
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The French National Research Agency (ANR) is gratefully acknowledged for the financial support of the Nanoskut Project (ANR-12-PRGE-0008-01).
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Manuscript submitted on December 31, 2020; accepted June 8, 2021.
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Drevet, R., Aranda, L., David, N. et al. Oxidation Behavior of the Skutterudite Material Yb0.2Co4Sb12. Metall Mater Trans A 52, 3996–4002 (2021). https://doi.org/10.1007/s11661-021-06359-6
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DOI: https://doi.org/10.1007/s11661-021-06359-6