Soft-x-ray investigation of Mg and Al oxides: Evidence for atomic and bandlike features

Journal Article · Tue Jun 15 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.15482· OSTI ID:6542482

O'Brien, W L; Jia, J; Dong, Q; Callcott, T A ^[1]; Mueller, D R; Ederer, D L ^[2]; Kao, C ^[3]

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1. University of Tennessee, Knoxville, Tennessee 37996 (United States)
2. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
3. Brookhaven National Laboratory, Upton, New York 11973 (United States)

Soft-x-ray emission (SXE) and soft-x-ray absorption (SXA) are used to investigate the electronic structure of [alpha]-Al[sub 2]O[sub 3], anodized Al[sub 2]O[sub 3], MgO, and MgAl[sub 2]O[sub 4]. It is found that both SXE and SXA are sensitive to the crystal phase, suggesting their use as a structural probe. Comparison of the Al [ital L][sub 2,3] SXE of [alpha]-Al[sub 2]O[sub 3] and the Mg [ital L][sub 2,3] SXE of MgO with local-density-approximation (LDA) density-of-states calculations shows that the agreement is good, and suggests that the final-state rule is valid for the SXE of these oxides. On the other hand, comparisons show that results of the SXA and LDA calculations are not in good agreement. A model based on atomiclike excitations explains a portion of the MgO SXA spectrum well. Evidence which suggests that the remaining features are due to band structure is given.

• OSTI ID: 6542482
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:23; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANODIZATION
CHALCOGENIDES
CHEMICAL COATING
COLLECTIVE EXCITATIONS
CORROSION PROTECTION
DEPOSITION
ELECTROCHEMICAL COATING
ELECTROLYSIS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
IONIZING RADIATIONS
LYSIS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SOFT X RADIATION
SPECTRA
SURFACE COATING
X RADIATION