Low-temperature synthesis of single-phase Co7Sb2O12

dc.contributor.authorBrito, MSL
dc.contributor.authorEscote, M. T.
dc.contributor.authorSantos, COP
dc.contributor.authorLisboa Filho, Paulo Noronha [UNESP]
dc.contributor.authorLeite, E. R.
dc.contributor.authorOliveira, JBL
dc.contributor.authorGama, L.
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Federal da Paraíba (UFPB)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Campina Grande (UFCG)
dc.date.accessioned2014-05-20T15:29:02Z
dc.date.available2014-05-20T15:29:02Z
dc.date.issued2004-12-15
dc.description.abstractPolycrystalline Co7Sb2O12 compounds have been synthesized by a chemical route, which is based on a modified polymeric precursor method. In order to study the physical properties of the samples, X-ray diffraction (XRD), thermal analyses (TG and DSC), infrared spectroscopy (IR), specific surface area (BET), and magnetization measurements were performed on these materials. Characterization through XRD revealed that the samples are single-phase after a heat-treatment at 1100degreesC for 2h, while the X-ray patterns of the samples heat-treated at lower temperatures revealed the presence of additional Bragg reflections belonging to the Co6Sb2O6 phase. These data were analyzed by means of Rietveld refinement and further analyze showed that Co7Sb2O12 displays an inverse spinel crystalline structure. In this structure, the Co2+ ions occupy the eight tetrahedral positions, and the sixteen octahedral positions are randomly occupied by the Sb5+ and Co2+ ions. IR studies disclosed two strong absorption bands, v(1) and v(2), in the expected spectral range for a spinel-type binary oxide with space group Fd3m. Exploratory studies concerning the magnetic properties indicated that this sample presents a spin-glass transition at T-f similar to 64 K. (C) 2004 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Fed Sao Carlos, Dept Quim, Lab Interdisciplinar Eletroquim & Ceram, Sao Carlos, SP, Brazil
dc.description.affiliationUniv Fed Paraiba, Dept Quim, BR-58059900 Joao Pessoa, Paraiba, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Quim, Lab Computac Cristalog & Analises Cristalinas, Araraquara, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos, Dept Fis, Lab Supercondutividade Magnetismo, BR-13560 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Fed Campina Grande, Dept Mat Engn, Lab Ceram, Campina Grande, Paraiba, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, Lab Computac Cristalog & Analises Cristalinas, Araraquara, SP, Brazil
dc.format.extent404-409
dc.identifierhttp://dx.doi.org/10.1016/j.matchemphys.2004.08.008
dc.identifier.citationMaterials Chemistry and Physics. Lausanne: Elsevier B.V. Sa, v. 88, n. 2-3, p. 404-409, 2004.
dc.identifier.doi10.1016/j.matchemphys.2004.08.008
dc.identifier.issn0254-0584
dc.identifier.lattes1353862414532005
dc.identifier.orcid0000-0002-7734-4069
dc.identifier.urihttp://hdl.handle.net/11449/38726
dc.identifier.wosWOS:000224744000027
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofMaterials Chemistry and Physics
dc.relation.ispartofjcr2.210
dc.relation.ispartofsjr0,615
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectpolymeric precursor methodpt
dc.subjectspinet structurept
dc.subjectRietveld refinementpt
dc.subjectspin-glass behaviorpt
dc.titleLow-temperature synthesis of single-phase Co7Sb2O12en
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes1353862414532005[4]
unesp.author.orcid0000-0002-7734-4069[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Farmacêuticas, Araraquarapt
unesp.departmentAnálises Clínicas - FCFpt

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