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Polyvinylpyrrolidone (PVP)/MnFe2O4 nanocomposite: Sol-Gel autocombustion synthesis and its magnetic characterization
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.ORCID iD: 0000-0001-5678-5298
2013 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 39, no 5, 5651-5658 p.Article in journal (Refereed) Published
Abstract [en]

A polyvinylpyrrolidone (PVP)/MnFe2O4 nanocomposite was prepared by the sol-gel autocombustion method and its structural, thermal, spectroscoppic, morphological and magnetic characterizations were done by XRD, FT-IR, TGA, SEM and VSM techniques. The presence of MnFe2O4 was confirmed by XRD and the size of crystallites was estimated to be 11 +/- 3 nm. Morphology analysis by SEM revealed spherical agglomerates of 15 nm. The magnetization curves confirm a superparamagnetic behavior with a blocking temperature of 287 K. The M-r/M-s value suggests the presence of uniaxial anisotropy in MnFe2O4 nanoparticles, instead of the expected cubic anisotropy according to the Stoner-Wohlfarth model. The effective magnetic anisotropy constant K-eff has been determined to be about 1.42 x 10(6) erg/cm(3) which is significantly higher than that of the bulk MnFe2O4. This suggests a strong magnetic coupling between magnetically ordered core spins and disordered surface spins of the nanoparticles in the nanocomposite.

Place, publisher, year, edition, pages
2013. Vol. 39, no 5, 5651-5658 p.
Keyword [en]
Sol-gel, Superparamagnetism, MnFe2O4, Magnetic nanomaterials
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-124029DOI: 10.1016/j.ceramint.2012.12.081ISI: 000318577600115ScopusID: 2-s2.0-84875735578OAI: diva2:633629

QC 20130627

Available from: 2013-06-27 Created: 2013-06-25 Last updated: 2013-06-27Bibliographically approved

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Toprak, Muhammet S.
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