Publications

The dynamic phase transformation and structure of rapidly solidified Fe1−xCoxSi2 (0.02less-than-or-equals, slantxless-than-or-equals, slant0.06) 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+ε→β and the subsidiary reaction α→β+Si. The low heating rates and Co contents were found to be beneficial for the β phase formation. The decomposition temperature of β→α+ε was weakly dependent on heating rate, but significantly suppressed by the high pressures.

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Chen, H. Y.; Zhao, X. B.; Zhu, T. J.; Jiang, J. Z.; Stiewe, C.; Lathe, C.; Müller, E. (2008): In-situ energy dispersive x-ray diffraction study of iron disilicide thermoelectric materials. Journal of Physics and Chemistry of Solids, 69, 8, 2013-2018.