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A series of full-Heusler alloys, $\rm Fe_2V_{1-x}W_xAl$, $0 \leq x \leq 0.2$,was prepared, characterized and relevant physical properties to account for thethermoelectric performance were studied in a wide temperature range.Additionally, off-stoichiometric samples with similar compositions have beenincluded, and a 10~\% improvement of the thermoelectric figure of merit wasobtained. The V/W substitution causes i) a change of the main carrier type,from holes to electrons as evidenced from Seebeck and Hall measurements and ii)a substantial reduction of the lattice thermal conductivity due to a creationof lattice disorder by means of a distinct different mass and metallic radiusupon the V/W substitution. Moreover $ZT$ values above 0.2 have been obtained. Amicroscopic understanding of the experimental data observed is revealed fromab-initio calculations of the electronic and phononic structure.

Stoichiometric and off-stoichiometric full Heusler $\mathbf {Fe_2V_{1-x}W_xAl} $ thermoelectric systems