Preparation and study of the thermoelectric properties of Fe2TiSn1-x Si x Heusler alloys

Polycrystalline alloys Fe2TiSn1-x Si (x) (0 x 1) theoretically predicted as highly efficient thermoelectric materials are experimentally studied. Structural studies show that the partial substitution of Sn with Si results in the formation of a multiphase state in samples with x > 0. Impurity phases in general lead to a significant decrease in the Seebeck coefficient and an increase in the thermal conductivity of Fe2TiSn1-x Si (x) samples, which does not allow consideration of these materials as promising thermoelectrics.