Soft x-ray emission spectra and the bonding of aluminum
The L/sub 2,3/ soft x-ray emission (SXE) spectra of Al in metallic Al, Al-Mn alloys, dilute Al-Mg alloys, the intermetallic compounds LiAl and Ni/sub 3/Al, the semiconducting alloy (Al-Ga)As and insulating Al/sub 2/O/sub 3/ are presented. The spectra provide a measure of the s-like partial density of states (PDOS) localized at the Al atoms and show prominent qualitative features that may be identified with each of the major types of bonding in solids, i.e., metallic, covalent and ionic. The spectra of metallic Al and of the Al-Mn alloys have parabolic densities of states characteristic of nearly free electron PDOS's. Al in Mg alloys have metallic PDOS's with a strong enhancement of the low energy region of the spectrum which is associated with screening of the extra charge on the Al ion core. In LiAl, the Al has tetragonal local symmetry, the spectrum is similar to that of silicon, and the bonding is a combination of covalent and metallic. In Al/sub x/Ga/sub 1-x/As alloys, the Al has tetragonal local symmetry, but the spectrum is strongly modified from the characteristic covalent form by the presence of a strong ionic component in the bonding. Finally, the spectrum of Al/sub 2/O/sub 3/ shows features characteristic of localized electronic orbitals and ionic bonding. 15 refs., 6 figs.
- Research Organization:
- Tennessee Univ., Knoxville (USA); National Bureau of Standards, Washington, DC (USA); Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5957291
- Report Number(s):
- CONF-8709135-3; ON: DE88000591
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ARSENIC COMPOUNDS
ARSENIDES
CHALCOGENIDES
CHEMICAL BONDS
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION
EMISSION SPECTRA
FUNCTIONS
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
INTERMETALLIC COMPOUNDS
IONIZING RADIATIONS
LITHIUM ALLOYS
MAGNESIUM ALLOYS
MANGANESE ALLOYS
METALS
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
PHOTON EMISSION
PNICTIDES
RADIATIONS
SOFT X RADIATION
SPECTRA
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
SYMMETRY
X RADIATION
X-RAY SPECTRA