Publication Date:
2011-06-10
Description:
The valence-band and core-level soft x-ray photoelectron spectroscopy has been applied to investigate the origin of the large thermoelectric power in the off-stoichiometric and partially-substituted Fe-based Heusler-type alloys Fe 2− x − y Ir y V 1+ x Al and Fe 2− x V 1+ x − y Ti y Al. The non-rigid-band-like change in the valence-band electronic structure near the Fermi level E F is found for the off-stoichiometric change x in Fe and V concentrations, whereas the rigid-bandlike shift of E F is recognized on the Ir or Ti substitution y . The non-rigid-band-like change may be induced by the excess-V or Fe (anti-site defects)-derived states in the pseudogap of Fe 2 VAl, while the rigid-band-like shift may be caused by a common band formation, where the d states of the substituted elements are incorporated into the main...
Print ISSN:
1757-8981
Electronic ISSN:
1757-899X
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
