Nanostructured Aluminium Hydroxyfluorides Derived from β-AlF3
| Autor: | Stanislas Pechev, Franck Fayon, Jean-Claude Lavalley, Jérôme Lhoste, Alain Demourgues, Alexandre Vimont, Christophe Legein, Jérôme Majimel, Damien Dambournet, Jean-Yves Buzaré, Charlotte Martineau, Alain Tressaud |
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| Rok vydání: | 2008 |
| Předmět: |
Diffraction
Materials science General Chemical Engineering Analytical chemistry chemistry.chemical_element General Chemistry Crystallography chemistry Surface-area-to-volume ratio Molar ratio Aluminium Materials Chemistry Particle size Crystallite Fourier transform infrared spectroscopy Line (formation) |
| Zdroj: | Chemistry of Materials. 20:1459-1469 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | Microwave-assisted synthesis has been applied for the preparation of aluminum hydroxyfluorides derived from β-AlF3. In the course of obtaining high-surface-area and homogeneous nanocrystallites, several key parameters have been adjusted. A relationship between the OH/F molar ratio and the stabilized allotropic forms has been pointed out. The surface area has been monitored depending on the water/isopropanol volume ratio. The microstructural properties of the as-prepared material have been thoroughly investigated highlighting X-ray line broadening arising from strains and size effects. It has been concluded from X-ray diffraction data refinements and TEM results that the prepared crystallites possess a platelet shape with an average particle size of 15 nm associated with a high surface area of 82 m2 g−1. The occurrence of hydroxyl groups inside the network has been detected by FTIR spectroscopy and considered angles and bond distances are probably located in peculiar crystallographic sites, i.e., 8f (F1) a... |
| Databáze: | OpenAIRE |
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