Optical properties and electronic structure of the intermetallic phases NiAl, CoAl, and FeAl

Abstract

The dielectric functions of the intermetallic B2 phases NiA1, CoA1, and FeAl have been determined by difFerential reflectometry and the Kramers-Kronig analysis in the energy range of 1.2 -5 eV for various compositions near stoichiometry. The experimental absorption maxima are correlated to the band structure of these alloys taken from the literature. All transitions could be assigned to the band structure. The shift of absorption maxima could be explained by a shift of the Fermi level according to the Ekman rule for transitions involving the Fermi level, and for other transitions by small changes of the band-structure levels in the range of about 0.01 eV/at % Al.

Oxygen impurities in NiAl: Relaxation effects

“…Kim et al [8] also calculated the band structure of NiAl using a semirelativistic linearized augmented plane wave method and compared the result with the experimental optical spectra. [8,9] Their result agreed with the result of Lui, and they found no need to incorporate self-energy corrections into the spectrum in order to fit their experimental data. This is markedly different from the result for CoAl where the corrections are needed to make a good fit.…”

A review of the optical properties of alloys and intermetallics for plasmonics

“…Damping to plasma frequency ratios of between 8. 85 [101], however interband transitions cover most of the spectrum, disrupting quality.…”

Influence of alloying on the thermodynamic stability of FeAl B2 phase

“…1) and compared the distance between energy bands in D and S directions in Brillouin zone with available theoretical [15] and experimental [16,17] data as shown in Table 1. Obtained results encourage further study of the behaviour of the electronic sub-system in FeAl doped by TM and containing vacancies.…”