Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1518339 | Journal of Physics and Chemistry of Solids | 2018 | 6 Pages |
Abstract
The dynamic phase transformation and structure of rapidly solidified Fe1âxCoxSi2 (0.02⩽x⩽0.06) thermoelectric materials were in situ investigated under high temperatures and high pressures by energy dispersive X-ray diffraction using synchrotron radiation. The FeSi2 alloys which solidified as α-Fe2Si5 and ε-FeSi eutectic structures, were transformed to the semiconducting β-FeSi2 phase upon heating by the main reaction α+εâβ and the subsidiary reaction αâβ+Si. The low heating rates and Co contents were found to be beneficial for the β phase formation. The decomposition temperature of βâα+ε was weakly dependent on heating rate, but significantly suppressed by the high pressures.
Keywords
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Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
H.Y. Chen, X.B. Zhao, T.J. Zhu, J.Z. Jiang, C. Stiewe, C. Lathe, E. Mueller,