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  Magnetization enhancement and cation valences in nonstoichiometric (Mn,Fe)3-δO4 nanoparticles

Antic, B., Kremenovic, A., Jovic, N., Pavlovic, M. B., Jovalekic, C., Nikolic, A. S., et al. (2012). Magnetization enhancement and cation valences in nonstoichiometric (Mn,Fe)3-δO4 nanoparticles. Journal of Applied Physics, 111(7): 074309. doi:10.1063/1.3700228.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000E-747E-F Version Permalink: https://hdl.handle.net/21.11116/0000-0007-589D-6
Genre: Journal Article

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 Creators:
Antic, B.1, Author
Kremenovic, A.2, Author
Jovic, N.1, Author
Pavlovic, M. B.3, Author
Jovalekic, C.4, Author
Nikolic, A. S.5, Author
Goya, G. F.6, Author
Weidenthaler, C.7, Author           
Affiliations:
1The “Vinča” Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia, ou_persistent22              
2Laboratory of Crystallography, Faculty of Mining and Geology, University of Belgrade, Djusina 7, 11001 Belgrade, Serbia, ou_persistent22              
3Faculty of Electrical Engineering, University of Belgrade, POB 3554, 11000, Belgrade, Serbia, ou_persistent22              
4Insitute for Multidisciplinary Studies, University of Belgrade, Kneza Viseslava 1, 11001 Belgrade, Serbia, ou_persistent22              
5Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia, ou_persistent22              
6Instituto de Nanociencia de Aragón and Departamento de Fisica de la Materia Condensada, Universidad de Zaragoza, Instituto de Nanociencia de Aragón and Departamento de Fisica de la Materia Condensada, Universidad de Zaragoza, Zaragoza, Spain, ou_persistent22              
7Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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 Abstract: We present a study of the structural and magnetic properties of (Mn,Fe)3-δO4 nanoparticles synthesized by soft mechanochemistry using Mn(OH)2 × 2 H2O and Fe(OH)3 powders as starting compounds. The resulting nanoparticles with a composition of the (Mn,Fe)3-δO4 type are found to have a core/shell structure with different Mn/Fe ratios in the core and at the surface. XPS analysis points to valences of +2, +3, and +4 for Mn and +3 for Fe at the particle surface. Combined results of XRPD, Mössbauer spectroscopy, and EDX analysis suggest that there is a deviation from stoichiometry in the nanoparticle core compared to the shell, accompanied by creation of cation polyvalence and vacancies. The value of saturation magnetization, MS, of 73.5 emu/g at room temperature, is among the highest reported so far among nanocrystalline ferrite systems of similar composition.

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Language(s): eng - English
 Dates: 2012-01-102012-04-052012-04-01
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.3700228
 Degree: -

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Title: Journal of Applied Physics
  Abbreviation : J. Appl. Phys.
Source Genre: Journal
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Publ. Info: New York, NY : AIP Publishing
Pages: - Volume / Issue: 111 (7) Sequence Number: 074309 Start / End Page: - Identifier: ISSN: 0021-8979
CoNE: https://pure.mpg.de/cone/journals/resource/991042723401880