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Enhanced coercivity in Co-rich near-stoichiometric CoFe3-xO4+delta nanoparticles prepared in large batches
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
Institució Catalana de Recerca i Estudis Avançats (ICREA).
Laboratório de Física Aplicada, Centro de Desenvolvimento da Tecnologia Nuclear, Minais Gerais.
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2007 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 19, no 20, 4957-4963 p.Article in journal (Refereed) Published
Abstract [en]

The relationship between the structure and composition with the magnetic properties of near stoichiometric cobalt ferrite nanoparticles CoxFe3-xO4+delta (0.85 < x < 1.1) prepared in large batches with average sizes in the range 60-210 nm has been investigated. Chemical analysis and Rietveld refinement of the X-ray diffraction data in conjunction with Mossbauer spectroscopy allowed us to identify an interplay between particle size, microstructure (concentration of interstitial ions, microstrain, cation arrangement in octahedral and tetrahedral sites), and composition, which sensitively controls the magnetic properties such as coercivity and saturation magnetization. In all cases, cobalt-rich compositions resulted in a higher coercivity, whereas lower degrees of inversion and higher iron contents led to slightly higher saturation magnetization values.

Place, publisher, year, edition, pages
2007. Vol. 19, no 20, 4957-4963 p.
Keyword [en]
cobalt ferrite nanoparticles, magnetic nanoparticles, spinel, nanocrystals, mossbauer, cofe2o4, nanostructures, crystalline, biomedicine, anisotropy
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-17000DOI: 10.1021/cm070827tISI: 000249871500016Scopus ID: 2-s2.0-35348816145OAI: oai:DiVA.org:kth-17000DiVA: diva2:335043
Note
QC 20100811Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Alternative Routes to Highly Dispersed Cobalt Ferrite Nanocomposites
Open this publication in new window or tab >>Alternative Routes to Highly Dispersed Cobalt Ferrite Nanocomposites
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 95 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2007:19
Keyword
aqueous precipitation, cobalt ferrite, nanoparticles, synthesis, size distribution, silane/silsesquioxane, epoxy, nanocomposites, magnetic cellulose
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-4328 (URN)978-91-7178-627-2 (ISBN)
Public defence
2007-04-20, Sal K2, KTH, Teknikringen 28, Stockholm, 14:00
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Supervisors
Note
QC 20100811Available from: 2007-04-12 Created: 2007-04-12 Last updated: 2010-08-11Bibliographically approved

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Salazar-Alvarez, GermanOlsson, Richard T.Gedde, Ulf W.Nogués, Josep
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