Publication Date:
2020-02-12
Description:
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.
Keywords:
550 - Earth sciences
Type:
info:eu-repo/semantics/article
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