Abstract
This study examines the oxidation behavior of skutterudite materials fabricated using a rapid self-propagating high-temperature synthesis and pulse plasma sintering route. Pure Co4Sb12 and Co4Sb10.8Se0.6Te0.6 were oxidized in the air at 773 K for up to 500 h. Skutterudites modified with Se and Te had a lower oxidation resistance than that of pure Co4Sb12 and also showed a lower decomposition temperature. This changed the oxidation mechanism, as manifested by the different roles of the Sb2O3 phase during oxide scale formation and the CoSb2-like phase in the modified near-surface region. The unusual mass loss by the Co4Sb10.8Se0.6Te0.6 alloy during the first 100 h of oxidation was also revealed. Despite the evident changes at the surface of the samples, no visible grain growth was noted in both skutterudites. The electrical properties of the samples were also stable.
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