Probing the thermal decomposition process of layered double hydroxides through in situ 57Fe Mössbauer and in situ X-ray diffraction experiments
| Autor: | M.G. da Silva, Antonio G. Souza Filho, J. A. C. De Paiva, Odair Pastor Ferreira, D. X. Gouveia, Josué Mendes Filho, Oswaldo Luiz Alves |
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| Rok vydání: | 2006 |
| Předmět: |
Diffraction
Materials science Mechanical Engineering Thermal decomposition Inorganic chemistry Analytical chemistry Layered double hydroxides Atmospheric temperature range engineering.material Mechanics of Materials Mössbauer spectroscopy X-ray crystallography engineering General Materials Science Lamellar structure Solid solution |
| Zdroj: | Journal of Materials Science. 42:534-538 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-006-1143-z |
| Popis: | The thermal decomposition properties of Mg–Fe hydrotalcites were studied through in situ 57Fe Mossbauer spectroscopy and in situ X-ray diffraction. Abrupt changes in the quadrupolar splitting measured in the Mossbauer spectra revealed a phase transition from the starting lamellar structure to a new crystalline arrangement. By analyzing the Mossbauer parameters we show that the material is highly disordered in the 300–400 °C temperature range. This hypothesis is confirmed by the X-ray results whose diffractograms indicated the collapse of the lamellar structure and the formation of a solid solution. |
| Databáze: | OpenAIRE |
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