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Synthesis of Ordered Mesoporous Fe 3 O 4 and γ-Fe 2 O 3 with Crystalline Walls Using Post-Template Reduction / Oxidation
| Content Provider | Semantic Scholar |
|---|---|
| Author | Jiao, Feng Jumas, J. C. Womes, Manfred Chadwick, Alan V. Harrison, Andrew Peter Bruce, Peter G. |
| Abstract | Ordered mesoporous Fe3O4 with crystalline walls (inverse spinel structure) has been synthesized for the first time, representing to the best of our knowledge, the first synthesis of a reduced mesoporous iron oxide. Synthesis was achieved by reducing ordered mesoporous R-Fe2O3 (corundum structure) to Fe3O4 spinel then to γ-Fe2O3 by oxidation, while preserving the ordered mesostructure and crystalline walls throughout. Such solid/solid transformations demonstrate the stability of the mesostructure to structural phase transitions from the hexagonal close packed oxide subarray of R-Fe2O3 (corundum structure) to the cubic close packed subarray of Fe3O4 spinel and γ-Fe2O3. Preliminary magnetic measurements reveal that the spins in both Fe3O4 and γ-Fe2O3 are frozen at 295 K, despite the wall thickness (7 nm) being less than the lower limit for such freezing in corresponding nanoparticles (>8 nm). |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://core.ac.uk/download/pdf/91796.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
