Abstract
To discuss the possibility of improvement in thermoelectric properties of β-FeSi 2, we examined anisotropy of the Seebeck coefficient of the β-FeSi 2 using single crystal specimens grown by temperature gradient solution growth method. Polyhedral shaped bulk crystals with facet planes were obtained, and they were confirmed as single phase of β-FeSi 2 by X-ray diffraction measurements. For measurements of the Seebeck coefficient, we developed an apparatus that is capable of measuring the Seebeck coefficient of a small specimen down to a few mm in size, because commercially available apparatus cannot be used for such small specimens. The Seebeck coefficient measured along one direction on a surface was around 294 μV/K, while that measured along another direction perpendicular to the former one was 218 μV/K. The difference was larger than experimental error, and appeared to attribute to the difference in crystallographic direction.
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