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The magnetic and oxidation behavior of bare and silica-coated iron oxide nanoparticles synthesized by reverse co-precipitation of ferrous ion (Fe.sup.2+./sup.) in ambient atmosphere
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SYSNO ASEP 0422566 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The magnetic and oxidation behavior of bare and silica-coated iron oxide nanoparticles synthesized by reverse co-precipitation of ferrous ion (Fe2+) in ambient atmosphere Author(s) Mahmed, N. (FI)
Heczko, Oleg (FZU-D) RID, ORCID
Lančok, Adriana (FZU-D) RID
Hannula, S.-P. (FI)Source Title Journal of Magnetism and Magnetic Materials. - : Elsevier - ISSN 0304-8853
Roč. 353, MAR (2014), s. 15-22Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords reverseco-precipitation ; ferrousion ; magnetite ; Mössbauer ; silica Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GAP107/11/0391 GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 UT WOS 000327785500004 DOI 10.1016/j.jmmm.2013.10.012 Annotation The synthesis of iron oxide nanoparticles, i.e., magnetite was attempted by using only ferrous ion (Fe2+) as a magnetite precursor, under an ambient atmosphere. The room temperature reverse co-precipitation method was used, by applying two synthesis protocols. The freshly prepared iron oxide was also immediately coated with Stöber silica (SiO2) layer, forming the coreshell structure. The phase, stoichiometry, crystallite and the particle size of the synthesized powders were determined by using X-ray diffraction (XRD) and transmission electron microscope (TEM), while the magnetic and oxidation behaviors were studied by using the vibrating sample magnetometer (VSM) and Mössbauer spectroscopy. Based on the results, the bare iron oxide nanoparticles are in the stoichiometry between the magnetite and the maghemite stoichiometry, i.e., oxidation occurs. This oxidation is depending on the synthesis protocols used. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015 Electronic address http://www.sciencedirect.com/science/article/pii/S0304885313007336
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