Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
Abstract (EDOC: 12638)
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.
(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.