Optical absorption in Al and dilute alloys of Mg and Li in Al at 4. 2 K

Journal Article · Mon Dec 15 04:00:00 EST 1975 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.12.5615· OSTI ID:7197396

Benbow, R L; Lynch, D W

The absorptances of Al and alloys of up to 5.5 at. percent of Li and Mg in Al were measured at 4.2/sup 0/K in the 0.2 to 3.0-eV range. The theory of Ashcroft and Sturm was fitted to the data. The fit obtained is reasonably good, provided three relaxation times are used, one for the Drude term and one for each type of transition between parallel bands. The fit is slightly better for the more concentrated alloys. In all cases the discrepancy between the fit and the data is greatest in the region between the two interband peaks in the optical conductivity, and known extensions to the theory do not qualitatively improve the fit. Pesudopotential Fourier coefficients U/sub 200/ and U/sub 111/ obtained from the fits vary with solute type and concentration. The variation can be explained semiquantitatively with a virtual-crystal pseudopotential. (auth)

• Research Organization: Ames Lab., IA
• OSTI ID: 7197396
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 12:12; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
BINARY ALLOY SYSTEMS
DILUTE ALLOYS
ENERGY LEVELS
LITHIUM ALLOYS
MAGNESIUM ALLOYS
OPACITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RELAXATION
TIME DEPENDENCE
ULTRALOW TEMPERATURE
VIRTUAL STATES