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2023-01-16T04:07:28Z
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Soft X-ray photoemission study of thermoelectric alloys Fe2−x−yIryV1+xAl and Fe2−xV1+x−yTiyAl
Soda, Kazuo
Harada, Shota
Kato, Masahiko
Yagi, Shinya
Inukai, Manabu
Miyazaki, Hidetoshi
Sandaiji, Yusuke
Tamada, Yuko
Tanaka, Suguru
Sugiura, Takahiro
Nishino, Yoichi
open access
This is the author's version of a work that was accepted for publication in Journal of Electron Spectroscopy and Related Phenomena. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms, may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Electron Spectroscopy and Related Phenomena. v.184, n.3–6, 2011, p.236–239, DOI:10.1016/j.elspec.2011.03.001.
X-ray photoelectron spectroscopy
Electronic structure
Thermoelectric power
Anti-site defects
Fe2 − x − yIryV1 + xAl
Fe2 − xV1 + x − yTiyAl
The valence-band and core-level photoemission spectra of n-type thermoelectric Heusler(L21)-type alloys Fe2 − x − yIryV1 + xAl and p-type ones Fe2 − xV1 + x − yTiyAl have been studied to clarify the origin of the enhancement of their thermoelectric power. It is found that the excess V content x (V-rich for x > 0 and Fe-rich for x < 0) causes the drastic change in the valence-band electronic structure within the binding energy of ∼0.7 eV near the Fermi level EF and the evolution of the satellite structures in the V 2p core-level spectra with x increased. These spectral features are ascribed to the formation of the Fe or V anti-site defects in the off-stoichiometric alloys with non-zero x. The shift of the valence-band and core-levels towards the high (low) binding energy side is observed on partial substitution y of Ir (or Ti) for Fe (or V), which is attributed to the EF shift due to the common band formation with the Ir 5d or Ti 3d states incorporated into the main Fe–V 3d bands. The enhancement of the thermoelectric power in those Heusler-type alloys can be explained in terms of the observed changes in the valence-band electronic structure near EF.
Advances in Vacuum Ultraviolet and X-ray Physics. The 37th International Conference on Vacuum Ultraviolet and X-ray Physics (VUVX2010)
Elsevier
2011-04
eng
journal article
AM
http://hdl.handle.net/2237/20776
https://nagoya.repo.nii.ac.jp/records/18681
https://doi.org/10.1016/j.elspec.2011.03.001
0368-2048
Journal of Electron Spectroscopy and Related Phenomena
184
3–6
236
239
https://nagoya.repo.nii.ac.jp/record/18681/files/VUVX2010proc_soda_R1BW.pdf
application/pdf
584.9 kB
2018-02-21