Manabu Inukai1, Hidetoshi Miyazaki1, Naoki Ide2 and Yoichi Nishino1
1Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555
We report the thermoelectric properties of the off-stoichiometric Fe2-yV1+x+yAl1-x alloys in the temperature range from 300 to 750 K. Fe2-yV1+x+yAl1-x alloys with V-rich (1+x+y < 1-x, i.e., y < -2x) and Al-rich (y < -2x) composition show the negative and positive sign of Seebeck coefficient, respectively, and the peak temperature of Seebeck coefficient shifts to the higher temperature side with increasing V and Al composition. Electrical resistivity of Fe2-yV1+x+yAl1-x alloys shows the metallic temperature dependence. Due to the combination of the Fe/V and V/Al off-stoichiometric effects, Fe1.97V1.12Al0.91 and Fe2.03V0.89Al1.08 alloys show the highest power factors of 4.03× 10-3 W/m K2 for n-type and 2.52× 10-3 W/m K2 for p-type at 500 K, respectively.
thermoelectric materials, Heusler alloys, off-stoichiometry, Seebeck coefficient
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