Mechanisms of phase formation along the synthesis of Mn-Zn ferrites by the polymeric precursor method

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dc.contributor.authorMartins, Murillo Longo [UNESP]
dc.contributor.authorFlorentino, Ariovaldo de Oliveira [UNESP]
dc.contributor.authorCavalheiro, Alberto Adriano
dc.contributor.authorSilva, Rafael Innocenti Vieira da [UNESP]
dc.contributor.authorSantos, Dayse Iara dos [UNESP]
dc.contributor.authorSaeki, Margarida Juri [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Mato Grosso do Sul (UEMS)
dc.date.accessioned2015-03-18T15:53:22Z
dc.date.available2015-03-18T15:53:22Z
dc.date.issued2014-12-01
dc.description.abstractConsidering the wide application of crystalline Mn-Zn ferrites microparticles, understanding synthesis routes that allow the achievement of such materials is a constant need. In this work, Mn-Zn ferrites, Mn(1-x)ZnxFe2O4 (0.15 <= x <= 0.30), were synthesized by the polymeric precursor method in well-cohtrolled steps and the mechanisms of phase formation under different thermal treatments were studied. Such investigation was performed by means of thermal analysis (TG/DTA), synchrotron X-ray powder diffraction (SXPD) (including in-situ and anomalous scattering experiments) and scanning electron microscopy (SEM). The ferrite precursor powders present the spinel as single crystalline phases whose cell parameters increase as Mn is substituted by Zn, indicating possible Fe deficiencies into the structure. The crystallization degree of these samples is also affected by the Mn substitution and reaches a maximum for x=0.25. Further thermal treatments in air at 700 degrees C and 1100 degrees C lead to additional events also related to the Zn content, such as carbonates elimination and crystallization of the contaminant phase hematite. Thermal treatments under N-2 atmosphere at 700 degrees C allow the achievement of powders with only the spinel phase, especially for x=0.25 for which highly crystalline and homogeneous ferrite is obtained despite the Fe deficiency determined by anomalous scattering SXPD. Finally, thermal treatments at 1100 degrees C under N-2 atmosphere jeopardize the stability of the spinel structure and lead to hematite precipitation. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, BR-18618970 Botucatu, SP, Brazil
dc.description.affiliationUniv Estadual Mato Grosso do Sul, Unidade Ensino Navirai, BR-79950000 Navirai, MS, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias, BR-17015970 Bauru, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, BR-18618970 Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias, BR-17015970 Bauru, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent16023-16031
dc.identifierhttp://dx.doi.org/10.1016/j.ceramint.2014.07.137
dc.identifier.citationCeramics International. Oxford: Elsevier Sci Ltd, v. 40, n. 10, p. 16023-16031, 2014.
dc.identifier.doi10.1016/j.ceramint.2014.07.137
dc.identifier.issn0272-8842
dc.identifier.lattes1802982806436894
dc.identifier.urihttp://hdl.handle.net/11449/116475
dc.identifier.wosWOS:000343353600077
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofCeramics International
dc.relation.ispartofjcr3.057
dc.relation.ispartofsjr0,784
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectMn-Zn ferritesen
dc.subjectPolymeric precursor methoden
dc.subjectX-ray diffractionen
dc.subjectThermal analysisen
dc.titleMechanisms of phase formation along the synthesis of Mn-Zn ferrites by the polymeric precursor methoden
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes1802982806436894
unesp.author.orcid0000-0002-9280-4334[5]

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