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

Weidenthaler, C., Antic, B., Kremenovic, A., Pavlovic, M., Jovalekic, C., Nikolic, A., 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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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-000E-747E-F Versions-Permalink: https://hdl.handle.net/11858/00-001M-0000-0019-E823-7
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Weidenthaler, Claudia1, Autor           
Antic, B.2, Autor
Kremenovic, A.3, Autor
Pavlovic, M.B4, Autor
Jovalekic, C.5, Autor
Nikolic, A.S.6, Autor
Goya, G.F.7, 8, Autor
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Univ Belgrade, Vinca Inst Nucl Sci, Belgrade 11001, Serbia, ou_persistent22              
3Univ Belgrade, Fac Min & Geol, Crystallog Lab , Belgrade 11001, Serbia , ou_persistent22              
4Univ Belgrade, Fac Elect Engn, Belgrade 11000, Serbia, ou_persistent22              
5Univ Belgrade, InsituteMultidisciplinary Studies , Belgrade 11001, Serbia, ou_persistent22              
6Univ Belgrade, Fac Chem, Belgrade 11000, Serbia, ou_persistent22              
7Univ Zaragoza, Inst Nanociencia Aragon, Zaragoza, Spain, ou_persistent22              
8Univ Zaragoza, Dept Fis Mat Condensada , Zaragoza, Spain, ou_persistent22              

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Schlagwörter: XPS SPECTRA; MOSSBAUER; PARTICLES; FERRITE; MN; FE
 Zusammenfassung: 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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 Datum: 2012-04-01
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1063/1.3700228
ISSN: 0021-8979
 Art des Abschluß: -

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Titel: JOURNAL OF APPLIED PHYSICS
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 111 (7) Artikelnummer: - Start- / Endseite: 074309 Identifikator: -