Abstract
We report on the effect of Co and Ti co-doping on the thermoelectric behavior of Fe 2 VAl based alloys. The doped alloys, (Fe 2-x Co x )(V 1-y Ti y )Al, with compositions x = 0.01-0.07 and y = 0.04-0.20 exhibit a p-type thermoelectric property when the total valence electron number is below 24. The co-doping of cobalt and titanium is believed to cause a substantial shift of the Fermi level from the center of the pseuodgap to a lower energy position. In particular, the alloy with x = 0.03 and y = 0.10 exhibits a p-type thermoelectric behavior with a large Seebeck coefficient of S = 85 μV/K as well as a low electrical resistivity of p = 2.3 μ Ωm at 400 K, so that the power factor, P = S 2 /p, reaches 3.2 x 10 -3 W/m K 2 . The power factor is larger than that of the Ti doped Fe 2 VAl alloy so far reported. The high power factor caused by the co-doping of Co and Ti might be due to a modification in the band structure on the valence band side around the Fermi level. The co-doping of Co and Ti is also effective in reducing the thermal conductivity, mainly due to phonon scattering.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
