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Influence of La3+ on structural, magnetic, dielectric, electrical and modulus spectroscopic characteristics of single phase CoFe2-xLaxO4 nanoparticles

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dc.title Influence of La3+ on structural, magnetic, dielectric, electrical and modulus spectroscopic characteristics of single phase CoFe2-xLaxO4 nanoparticles en
dc.contributor.author Yadav, Raghvendra Singh
dc.contributor.author Kuřitka, Ivo
dc.contributor.author Vilčáková, Jarmila
dc.contributor.author Havlica, Jaromír
dc.contributor.author Kalina, Lukáš
dc.contributor.author Urbánek, Pavel
dc.contributor.author Machovský, Michal
dc.contributor.author Masař, Milan
dc.contributor.author Holek, Martin
dc.relation.ispartof Journal of Materials Science: Materials in Electronics
dc.identifier.issn 0957-4522 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2017
utb.relation.volume 28
utb.relation.issue 12
dc.citation.spage 9139
dc.citation.epage 9154
dc.type article
dc.language.iso en
dc.publisher Springer New York LLC
dc.identifier.doi 10.1007/s10854-017-6648-5
dc.relation.uri https://link.springer.com/article/10.1007/s10854-017-6648-5
dc.description.abstract In this work, we have studied the influence of La3+ substitution on structural, magnetic, dielectric, electrical and modulus spectroscopic characteristics of cobalt ferrite nanoparticles synthesized by starch-assisted sol–gel combustion method. The powder X-ray diffraction analysis confirms the formation of single-phase CoFe2−xLaxO4 (x = 0.00, 0.05, 0.10, 0.15, 0.20) spinel ferrite nanoparticles. Raman spectroscopy study also reveals the formation of single phase spinel ferrite crystal structure. The morphological feature of synthesized ferrite nanoparticle was observed by scanning electron microscopy that demonstrate formation of spherical nanoparticles with grain size 10–50 nm. The presence of constituent’s, i.e., Co, Fe and La were authenticated by energy dispersive X-ray analysis. The magnetic parameters are measured by employing vibrating sample magnetometer. The saturation magnetization decreases with La3+ substitution, whereas coercivity shows anomalous behaviour. Cation redistribution in spinel ferrite nanoparticles are confirmed by X-ray photoelectron spectroscopy. The variation of dielectric constant (ϵ′, ϵʺ), loss tangent (tanδ), ac conductivity (σ), electric modulus (M′, Mʺ) and impedance (Z′, Zʺ) as a function of La3+ ion concentration and frequency has been investigated. The dielectric constant and ac conductivity increases with increase of La3+ substitution, whereas dielectric loss tangent exhibits anomalous behaviour. The modulus spectra reveal two semicircles associated with grain and grain boundary effects. The cole–cole plots in modulus formalism show that the electrical characteristics contribute from both the grains and grain boundaries. Modulus spectra suggest that the distribution of relaxation times and conduction mechanism are influenced by La3+ ion substitution in cobalt ferrite nanoparticles. © 2017, Springer Science+Business Media New York. en
utb.faculty University Institute
dc.identifier.uri http://hdl.handle.net/10563/1007425
utb.identifier.obdid 43876559
utb.identifier.scopus 2-s2.0-85015204304
utb.identifier.wok 000401819000097
utb.source j-scopus
dc.date.accessioned 2017-09-08T12:14:55Z
dc.date.available 2017-09-08T12:14:55Z
dc.description.sponsorship Ministry of Education, Youth and Sports of the Czech Republic-Program NPU I [LO1504]
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Yadav, Raghvendra Singh
utb.contributor.internalauthor Kuřitka, Ivo
utb.contributor.internalauthor Vilčáková, Jarmila
utb.contributor.internalauthor Urbánek, Pavel
utb.contributor.internalauthor Machovský, Michal
utb.contributor.internalauthor Masař, Milan
utb.contributor.internalauthor Holek, Martin
utb.scopus.affiliation Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida Tomase Bati 5678, Zlín, Czech Republic; Materials Research Centre, Brno University of Technology, Purkyňova 464/118, Brno, Czech Republic
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