Optical properties and electronic structure of. beta. '-NiAl
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), Vol. 21:12
- Country of Publication:
- United States
- Language:
- English
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