Raman microspectroscopy of some iron oxides and oxyhydroxides
| Autor: | M. T. de Oliveira, Dalva Lúcia Araújo de Faria, S. Venâncio Silva |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Goethite
Inorganic chemistry Analytical chemistry Maghemite Hematite engineering.material symbols.namesake chemistry.chemical_compound chemistry visual_art visual_art.visual_art_medium engineering symbols General Materials Science Wüstite Laser power scaling Lepidocrocite Raman spectroscopy Spectroscopy Magnetite |
| Zdroj: | Journal of Raman Spectroscopy. 28:873-878 |
| ISSN: | 1097-4555 0377-0486 |
| DOI: | 10.1002/(sici)1097-4555(199711)28:11<873::aid-jrs177>3.0.co;2-b |
| Popis: | Hematite (α-Fe2O3), magnetite (Fe3O4), wustite (FeO), maghemite (γ-Fe2O3), goethite (α-FeOOH), lepidocrocite (γ-FeOOH) and δ-FeOOH were studied by Raman microscopy. Such compounds have already been studied by Raman spectroscopy, but there are some disagreements in the reported data. Here, Raman microscopy was employed to investigate the laser power dependence of the spectra of these oxides and oxyhydroxides. Low laser power was used for the reference spectra in order to minimize the risks of spectral changes due to sample degradation. The results obtained show that increasing laser power causes the characteristic bands of hematite to show up in the spectra of most of the compounds studied whereas the hematite spectrum undergoes band broadening and band shifts. © 1997 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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