Thermal and transport properties of the Heusler-type compounds Fe2−xTi1+xSn

Abstract

We have studied the thermoelectric properties of the stoichiometric and off-stoichiometric Heusler compounds Fe2−xTi1+xSn between 10K and 400K. It is found that the electrical resistivity and Seebeck coefficient are very sensitive to the off-stoichiometry. Seebeck coefficient (S) measurements indicate that all studied materials are p-type materials with moderate S values of about 20–30μV∕K at room temperature. Broad maximums at around 330K are observed in S for Fe2TiSn and Fe2.05Ti0.95Sn, and this maximum shifts to higher temperatures with replacing more Ti for Fe. These features are consistent with other experimental results and are related to issues raised by band-structure calculations.