Mössbauer studies in an external field of well-crystallized Al-maghemites made from hematite
| Autor: | E. De Grave, A. M. Bryan, L. H. Bowen |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Nuclear and High Energy Physics
Chemistry Maghemite engineering.material Hematite Condensed Matter Physics Atomic and Molecular Physics and Optics Spectral line Crystallography Nuclear magnetic resonance Octahedron visual_art Mössbauer spectroscopy engineering visual_art.visual_art_medium Physical and Theoretical Chemistry Thin film Solubility Spectroscopy |
| Zdroj: | Hyperfine Interactions. 94:1977-1982 |
| ISSN: | 1572-9540 0304-3843 |
| Popis: | A series of hematites with up to 15 mol% Al substitution was converted to maghemites by reduction in the presence of organic matter, followed by slow oxidation. The maghemites formed were studied by Mossbauer spectroscopy in an external field of 60 kOe at 4 K. This technique allows the determination of site occupancy as well as the canting angle. The spectra are in agreement with a model having both vacancies and Al only in the octahedral sites and small canting angles for both sites. A small dipolar field at the tetrahedral sites was required to fit the line shape. The data indicate that about 10 mol% Al may be a solubility limit in maghemite. |
| Databáze: | OpenAIRE |
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