Synthesis of stoichiometric Ca2Fe2O5 nanoparticles by high-energy ball milling and thermal annealing

Amorim, Bruno Ferreira; Morales, Marco Antonio Morales; Bohn, Felipe; Carriço, Artur Silva; Medeiros, Suzana Nóbrega de; Dantas, Ana L.

Synthesis of stoichiometric Ca2Fe2O5 nanoparticles by high-energy ball milling and thermal annealing

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dc.contributor.author	Amorim, Bruno Ferreira
dc.contributor.author	Morales, Marco Antonio Morales
dc.contributor.author	Bohn, Felipe
dc.contributor.author	Carriço, Artur Silva
dc.contributor.author	Medeiros, Suzana Nóbrega de
dc.contributor.author	Dantas, Ana L.
dc.date.accessioned	2020-06-16T18:45:33Z
dc.date.available	2020-06-16T18:45:33Z
dc.date.issued	2016-05-01
dc.description.resumo	We report the synthesis of Ca2Fe2O5 nanoparticles by high-energy ball milling and thermal annealing from α-Fe2O3 and CaCO3. Magnetization measurements, Mössbauer and X-ray spectra reveal that annealing at high temperatures leads to better quality samples. Our results indicate nanoparticles produced by 10 h high-energy ball milling and thermal annealing for 2 h at 1100 °C achieve improved stoichiometry and the full weak ferromagnetic signal of Ca2Fe2O5. Samples annealed at lower temperatures show departure from stoichiometry, with a higher occupancy of Fe3+ in octahedral sites, and a reduced magnetization. Thermal relaxation for temperatures in the 700–1100 °C range is well represented by a Néel model, assuming a random orientation of the weak ferromagnetic moment of the Ca2Fe2O5 nanoparticles	pt_BR
dc.identifier.citation	AMORIM, B.F.; MORALES, M.A.; BOHN, F.; CARRIÇO, A.S.; MEDEIROS, S.N. de; DANTAS, A.L.. Synthesis of stoichiometric Ca2Fe2O5 nanoparticles by high-energy ball milling and thermal annealing. Physica B: Condensed Matter, [s.l.], v. 488, p. 43-48, maio 2016. Elsevier. Disponível em: https://www.sciencedirect.com/science/article/pii/S0921452616300308?via%3Dihub. Acesso em: 10 jun. 2020. https://doi.org/10.1016/j.physb.2016.01.029.	pt_BR
dc.identifier.doi	10.1016/j.physb.2016.01.029
dc.identifier.issn	1678-765X
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29272
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Dicalcium ferrite	pt_BR
dc.subject	Dicalcium ferrite	pt_BR
dc.subject	Dicalcium ferrite	pt_BR
dc.subject	X-ray diffraction	pt_BR
dc.subject	Magnetic nanoparticles	pt_BR
dc.title	Synthesis of stoichiometric Ca2Fe2O5 nanoparticles by high-energy ball milling and thermal annealing	pt_BR
dc.type	article	pt_BR