Oxidation Behavior of Filled Skutterudite CeFeSb in Air

Xia, Xugui; Qiu, Pengfei; Huang, Xiangyang; Wan, Shun; Qiu, Yuting; Li, Xiaoya; Chen, Lidong
June 2014
Journal of Electronic Materials;Jun2014, Vol. 43 Issue 6, p1639
Academic Journal
The oxidation behavior of CeFeSb compound in air was studied in this work. x-Ray diffractometry, scanning electron microscopy observation, and activation energy calculation suggest that CeFeSb is very easily oxidized at elevated temperature. The reason for the weak resistance to oxidation is mainly due to the unstable 'FeSb' structure and the high Ce filling fraction in the skutterudite voids. At elevated temperature, Ce fillers which have high oxygen affinity firstly react with oxygen. This process proceeds accompanied by decomposition of 'FeSb' into FeSb and Sb, which in turn accelerates the oxidation rate. The Ce fillers in CeFeSb provide a short path for rapid interdiffusion of oxygen, which leads to fast growth of the oxide layer, with thickness of about 200 μm at 900 K after only 1 h exposure in air. This result suggests that appropriate protection from oxidation is necessary for real applications of CeFeSb.


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