2024-03-28T11:34:50Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00020722
2023-01-16T04:07:52Z
320:321:322
Thermoelectric properties of Heusler-type off-stoichiometric Fe2V1+xAl1−x alloys
Miyazaki, Hidetoshi
Tanaka, Suguru
Ide, Naoki
Soda, Kazuo
Nishino, Yoichi
open access
We report the thermoelectric properties of Heusler-type off-stoichiometric Fe2V1+xAl1−x alloys. Due to the off-stoichiometric effect, which is the substitution of V/Al atoms with Al/V atoms, semiconductor-like electric resistivity behavior in Fe2VAl is changed to metallic behavior in Fe2V1+xAl1−x alloys and both positive and negative absolute Seebeck coefficients are drastically increased. The maximum thermoelectric power factor of Fe2V1+xAl1−x alloys is 4.3 × 10−3 (x = −0.03: p-type) and 6.8 × 10−3 W mK−2 (x = 0.05: n-type) with a peak temperature in the range 300–600 K, exceeding the values of previously reported Fe-based Heusler alloys as well as those of available thermoelectric materials such as Bi-Te semiconductors. Based on x-ray diffraction and photoemission spectroscopy results, it is thought that the maintenance of the Heusler-type (L21) crystal structure and the modification of the electronic structure due to the off-stoichiometry could explain the large thermoelectric power factor and high peak temperature in Fe2V1+xAl1−x alloys.
IOP Publishing
2014-03
eng
journal article
AM
http://hdl.handle.net/2237/22844
https://nagoya.repo.nii.ac.jp/records/20722
https://doi.org/10.1088/2053-1591/1/1/015901
2053-1591
Materials Research Express
1
1
015901
015901
https://nagoya.repo.nii.ac.jp/record/20722/files/MRX_miyazaki_NIT_2nd.pdf
application/pdf
853.1 kB
2018-02-21