Saturation magnetization change with structure in CoFe2O4 nanostructures prepared from metallic iron and cobalt by wet grinding method

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buir.contributor.authorToprak, Ahmet
dc.citation.epage1108en_US
dc.citation.issueNumber2en_US
dc.citation.spage1101en_US
dc.citation.volumeNumber34en_US
dc.contributor.authorKaynar, M. B.en_US
dc.contributor.authorToprak, Ahmeten_US
dc.contributor.authorÖzcan, Ş.en_US
dc.date.accessioned2020-02-05T07:02:18Z
dc.date.available2020-02-05T07:02:18Z
dc.date.issued2019
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractNanocrystalline cobalt ferrite (CoFe2O4) has been synthesized directly from metallic cobalt (Co) and iron (Fe) via wet-milling followed by calcination. The calcination took place in atmosphere at 750 ◦C. After calcination, samples were dry-milled for up to 12 h to investigate the effects of their mean crystallite sizes and microstress on their magnetic properties. The mean crystallite sizes of the samples were calculated from X-ray powder diffraction (XRD) patterns using a Rietveld analysis program (MaudLab). Results show that the calcined sample had a crystallite size of around 60 nm, which decreased to 12 nm after 12 h of drymilling. However, agglomerated nanocrystallites were observed in the transmission electron microscopy (TEM) images of the material. Rietveld analysis also shows an increase in microstrain from 2 x 10-4 to 1.4 x 10-3 after increasing the dry-milling time to 12 h due to crystal defects induced by collisions while drymilling. The electron binding energies of the Co+2 were measured by X-ray photoelectron spectroscopy (XPS) to determine the degree of inversion, which was used to calculate the saturation magnetization. Vibrating sample magnetometer (VSM) measurements revealed that milling decreased the saturation magnetization from 125 emu g-1 to 57 emu g-1 even the calculated saturation magnetization increased from 4.87 µB to 6.17 µB.en_US
dc.identifier.doi10.17341/gazimmfd.460506en_US
dc.identifier.issn1300-1884
dc.identifier.urihttp://hdl.handle.net/11693/53076
dc.language.isoTurkishen_US
dc.publisherGazi Üniversitesi Mühendislik-Mimarlıken_US
dc.relation.isversionofhttps://dx.doi.org/10.17341/gazimmfd.460506en_US
dc.source.titleJournal of the Faculty of Engineering and Architecture of Gazi Universityen_US
dc.subjectCobalt-ferriteen_US
dc.subjectWet-millingen_US
dc.subjectMagnetic propertiesen_US
dc.subjectNanocrystalliteen_US
dc.titleSaturation magnetization change with structure in CoFe2O4 nanostructures prepared from metallic iron and cobalt by wet grinding methoden_US
dc.title.alternativeIslak öğütme yöntemi ile metalik demir ve kobalttan hazırlanmış CoFe2O4 nanoyapılarda doyum manyetizasyonunun yapıya bağlı değişimien_US
dc.typeArticleen_US
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