Abstract
Heuslertype Fe2V1-xAl1+x alloys having offstoichiometric composition were fabricated by the powder metallurgical process using mechanical alloying and pulsed current sintering. Depending on the valence electron concentration, a positive (x> 0) or negative (x<0) Seebeck coefficient was obtained resulting from a Fermi level shift. The electrical resistivity was reduced via the carrier doping effect, resulting in an increase of the thermoelectric power factor of 2.8 mW/mK2 for ptype and 5.0 mW/ mK2 for ntype. In addition, the thermal conductivity was reduced by phonon scattering at crystal lattice defects induced by the offstoichiometry. Consequently the thermoelectric figureofmerit, ZT, was enhanced and reached 0.07 for ptype and 0.18 for ntype at around 500 K. Using the measured thermoelectric properties, the power generation ability was estimated. Owing to the enhancement of thermoelectric performance especially at high temperatures, power generation efficiency reaches 2 at temperature difference between 300 K and 773 K. [doi:10.2320/jinstmet.JA201520]
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More From: Journal of the Japan Institute of Metals and Materials
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