Enhanced coercivity in Co-rich near-stoichiometric CoFe3-xO4+delta nanoparticles prepared in large batches
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
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.
cobalt ferrite nanoparticles, magnetic nanoparticles, spinel, nanocrystals, mossbauer, cofe2o4, nanostructures, crystalline, biomedicine, anisotropy
IdentifiersURN: urn:nbn:se:kth:diva-17000DOI: 10.1021/cm070827tISI: 000249871500016ScopusID: 2-s2.0-35348816145OAI: oai:DiVA.org:kth-17000DiVA: diva2:335043
QC 201008112010-08-052010-08-052010-12-09Bibliographically approved