Optical properties and electronic structure of. beta. '-NiAl

Journal Article · Sun Jun 15 04:00:00 EDT 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.21.5505· OSTI ID:5281193

Peterman, D J; Rosei, R; Lynch, D W; Moruzzi, V L

The optical constants and their temperature derivatives have been determined for ..beta..'-NiAl from absorption and thermoreflectance measurements in the energy range of 0.2--4.4 eV. The results are interpreted using the self-consistent energy bands of Moruzzi, Williams, and Gelatt. By comparing a calculated joint density of states with epsilon/sub 2/, the imaginary part of the dielectric function, good overall agreement is found between theory and experiment. In contrast to earlier analyses, it is found that the 2.5-eV peak in epsilon/sub 2/ is primarily due to direct interband transitions terminating near the Fermi surface. This new interpretation of the 2.5-eV feature is discussed in relation to previously reported concentration effects and the rigid-band model.

• Research Organization: Ames Laboratory, U. S. Department of Energy and Department of Physics, Iowa State University, Ames, Iowa 50011
• OSTI ID: 5281193
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 21:12; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
BAND THEORY
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
NICKEL ALLOYS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES