Electrical and magnetic properties of NiZn Ferrite prepared by conventional and solar sintering

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dc.contributor.author Gutiérrez López, Jesús
dc.contributor.author Masó, Nahum
dc.contributor.author Levenfeld Laredo, Belén
dc.contributor.author Varez, Alejandro
dc.contributor.author West, Anthony R.
dc.date.accessioned 2021-05-19T08:45:59Z
dc.date.available 2021-05-19T08:45:59Z
dc.date.issued 2016-07
dc.identifier.bibliographicCitation Journal of the American Ceramic Society, 99(7), July 2016, Pp. 2327-2333
dc.identifier.issn 1551-2916
dc.identifier.issn 0002-7820 (online)
dc.identifier.uri http://hdl.handle.net/10016/32674
dc.description.abstract The electrical properties of polycrystalline NiZn ferrite, Zn0.44Ni0.38Fe2.18O4, were investigated by impedance spectroscopy over the frequency and temperature ranges, 5 Hz to 2 MHz and 10-600 K and by magnetic permeability measurements at room temperature. Samples were sintered in either conventional or solar furnaces followed by quenching or slow cooling to ambient temperature. Depending on processing conditions, the room-temperature electrical resistivity of conventionally sintered samples varied by seven orders of magnitude, from 5 ohm cm for a sample quenched from 1250 degrees C to 10 Mohm cm for a sample quenched from 400 degrees C. These differences were attributed to variations in oxygen content of the ferrite which decreased with increasing quench temperature. Oxygen deficiency led to mixed valence of Fe in the octahedral B sites of the spinel structure and was responsible for high electronic conductivity with low activation energy at low temperatures in oxygen-deficient samples. By contrast, in oxygen-stoichiometric samples, Fe on the tetrahedral A sites was believed to be divalent and Fe on the octahedral B sites to be entirely trivalent. Electron hopping between A and B sites had much higher activation energy and dominated the conductivity at high temperature for all samples. Samples sintered in the solar furnace were much more conductive than ones that were slow-cooled after conventional sintering and this is attributed to the relatively rapid cooling rate after exposure in the solar furnace, which preserved some of the oxygen deficiency present at high temperature. For the same reason, samples that were slow cooled in N-2 were also much more conductive.
dc.description.sponsorship The authors thank the regional (Comunidad Autonoma de Madrid) government (MATERYENER3CM S2013/MIT-2753) and the national government (MINECO) (MAT2013-46452-C4-3R) for financial support.
dc.format.extent 7
dc.language.iso eng
dc.publisher The American Ceramic Society
dc.publisher John Wiley & Sons, Inc.
dc.rights © 2016 The American Ceramic Society
dc.subject.other Errites
dc.subject.other Impedance spectroscopy
dc.subject.other Sinter/sintering
dc.subject.other Nickel-Zinc Ferrites
dc.subject.other Citrate Precursor Technique
dc.subject.other Dielectric properties
dc.subject.other Zn Ferrites
dc.subject.other Resistivity
dc.subject.other Temperature
dc.subject.other Ceramics
dc.title Electrical and magnetic properties of NiZn Ferrite prepared by conventional and solar sintering
dc.type article
dc.subject.eciencia Materiales
dc.identifier.doi https://doi.org/10.1111/jace.14225
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. MAT2013-46452-C4-3R
dc.relation.projectID Comunidad de Madrid. S2013/MIT-2753/MATERYENER3CM
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 2327
dc.identifier.publicationissue 7
dc.identifier.publicationlastpage 2333
dc.identifier.publicationtitle Journal of the American Ceramic Society
dc.identifier.publicationvolume 99
dc.identifier.uxxi AR/0000018331
dc.contributor.funder Comunidad de Madrid
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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