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Carbon-Substituted Hematite and Magnetite Nanoparticles

Published online by Cambridge University Press:  21 December 2015

Monica Sorescu  and
Richard Trotta
Monica Sorescu*
Affiliation:
Duquesne University, Department of Physics, Fisher Hall, Pittsburgh, PA 15282
Richard Trotta
Affiliation:
Duquesne University, Department of Physics, Fisher Hall, Pittsburgh, PA 15282
*
*(Email: sorescu@duq.edu)
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Abstract

Graphite-doped hematite and magnetite nanoparticles systems (∼50 nm) were prepared by mechanochemical activation for milling times ranging from 2 to 12 hours. Their structural and magnetic properties were studied by 57Fe Mössbauer spectroscopy. The spectra corresponding to the hematite milled samples were analyzed by considering two sextets, corresponding to the incorporation of carbon atoms into the iron oxide structure. For ball milling time of 12 hours a quadrupole split doublet has been added, representing the contribution of ultrafine particles. The Mössbauer spectra of graphite-doped magnetite were resolved considering a sextet and a magnetic hyperfine field distribution, corresponding to the tetrahedral and octahedral sublattices of magnetite, respectively. A quadrupole split doublet was incorporated in the fitting of the 12-hour milled sample. The recoilless fraction for all samples was determined using our previously developed dual absorber method. It was found that the recoilless fraction of the graphite-doped hematite nanoparticles decreases as function of ball milling time. The f factor of graphite-containing magnetite nanoparticles for the tetrahedral sites stays constant, while that of the octahedral sublattice decreases as function of ball milling time. These findings reinforce the idea that carbon atoms exhibit preference for the octahedral sites of magnetite.

Keywords

magnetic propertiesM"ssbauer effectnanostructure
Type
Articles
Information
MRS Advances , Volume 1 , Issue 3: Nanomaterials and Synthesis , 2016 , pp. 221 - 226
Copyright
Copyright © Materials Research Society 2015 

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