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http://dx.doi.org/10.4150/KPMI.2008.15.5.345

Consolidation of p-type Fe(Mn)Si2 Thermoelectric Powder and Microstructure  

Shim, J.S. (Department of Nano Materials Science and Engineering, Chungnam National University)
Hong, S.J. (Division of Advanced Materials Engineering, Kongju National University)
Chun, B.S. (Department of Nano Materials Science and Engineering, Chungnam National University)
Publication Information
Journal of Powder Materials / v.15, no.5, 2008 , pp. 345-351 More about this Journal
Abstract
The effects of the dopant (Mn) ratio on the microstructure and thermoelectric properties of $FeSi_2$ alloy were studied in this research. The alloy was fabricated by a combination process of ball milling and high pressure pressing. Structural behavior of the sintered bulks were systematically investigated by XRD, SEM, and optical microscopy. With increasing dopan (Mn) ratio, the density and ${\varepsilon}-FeSi$ phase of the sintered bulks increased and maximum density of 94% was obtained in the 0.07% Mn-doped alloy. The sintered bulks showed fine microstructure of ${\alpha}-Fe_{2}Si_{5}$, ${\varepsilon}-FeSi$ and ${\beta}-FeSi_2$ phase. The semiconducting phase of ${\beta}-FeSi_2$ was transformed from ${\alpha}-Fe_{2}Si_{5}+{\varepsilon}-FeSi$ phase by annealing.
Keywords
Thermoelectric materials$Fe(Mn)Si_2$ powder; Sintering${\beta}-FeSi_2$ phase;
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