Bentonite/Iron Oxide Composites: Preparation and Characterization by Hyperfine Methods
| Autor: | V. Chlan, V. Procházka, Josef Štěpánek, R. Řezníček, Ivo Medřík, Petr Křišťan, Helena Štěpánková, Kateřina Poláková, Karel Kouřil, Jan Čuda |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Article Subject Iron oxide Maghemite engineering.material Isothermal process law.invention chemistry.chemical_compound chemistry law Phase (matter) lcsh:Technology (General) Bentonite engineering medicine lcsh:T1-995 Ferric General Materials Science Calcination Composite material Hyperfine structure medicine.drug |
| Zdroj: | Journal of Nanomaterials, Vol 2013 (2013) |
| ISSN: | 1687-4129 1687-4110 |
| Popis: | Bentonite/iron oxide system is prepared by isothermal calcination of powder composed of bentonite clay and precursor containing ferric acetate. This preparation technique enables one to get the composite material directly, that is, iron oxide particles embedded in a bentonite matrix. Calcination temperatureTcalcis varied from 320°C to 700°C. The resulting series of samples is characterized by local methods based on hyperfine interactions:57Fe nuclear magnetic resonance (NMR) and the Mössbauer spectroscopy. The results show that the phase composition changes significantly in dependence on calcination temperature. The amount of maghemite phase rapidly increases up toTcalc=420°C and decreases abruptly forTcalchigher than 460°C. |
| Databáze: | OpenAIRE |
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