Optical properties and electronic structures of Ni3Al alloys

Date
1997-02-01
Authors
Rhee, Joo
Lynch, David
Harmon, Bruce
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Research Projects
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Physics and Astronomy
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Abstract

The dielectric functions of Ni3Al polycrystalline alloys were measured by spectroscopic ellipsometry in the energy range of 1.5–5.4 eV. The samples were Ni1−xAlx alloys with x=0.2625,0.2525,0.25,0.244, and 0.2359. One broad peak was observed in the optical-conductivity spectra around 4.4 eV. The band structures and the optical conductivity were calculated in the Au3Cu structure with the linearized-augmented-plane-wave method. By including both energy-dependent broadening and an approximate self-energy correction the calculated optical-conductivity spectrum gives quite good agreement with experiment. The calculation shows that the main contribution to the 4.4 eV peak comes from the k points close to the Γ-M-R plane and near the midpoints of the X-M line and Γ-M line.

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This article is from Physical Review B 55 (1997): 4124, doi:10.1103/PhysRevB.55.4124. Posted with permission.

Keywords
Ames Laboratory, polycrystalline, spectroscopic ellipsometry
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