Soft-x-ray investigation of Mg and Al oxides: Evidence for atomic and bandlike features
| Autor: | C.-C. Kao, D. L. Ederer, Jianjun Jia, T. A. Callcott, O'Brien Wl, D. R. Mueller, Dong Qy |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Physical Review B. 47:15482-15486 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.47.15482 |
| Popis: | Soft-x-ray emission (SXE) and soft-x-ray absorption (SXA) are used to investigate the electronic structure of \ensuremath{\alpha}-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, anodized ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, MgO, and ${\mathrm{MgAl}}_{2}$${\mathrm{O}}_{4}$. It is found that both SXE and SXA are sensitive to the crystal phase, suggesting their use as a structural probe. Comparison of the Al ${\mathit{L}}_{2,3}$ SXE of \ensuremath{\alpha}-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ and the Mg ${\mathit{L}}_{2,3}$ 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. |
| Databáze: | OpenAIRE |
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