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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/61418
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dc.creatorAnees Abdul Azizpt_BR
dc.creatorSilvana Merconept_BR
dc.creatorRicardo P. S. M. Lobopt_BR
dc.creatorAnderson Diaspt_BR
dc.creatorRoberto Luiz Moreirapt_BR
dc.creatorAnthony Martin Thomas Bellpt_BR
dc.creatorRoger Ecclestonpt_BR
dc.creatorAntonio Feteirapt_BR
dc.date.accessioned2023-11-27T20:04:18Z-
dc.date.available2023-11-27T20:04:18Z-
dc.date.issued2019-
dc.citation.volume48pt_BR
dc.citation.spage11112pt_BR
dc.citation.epage11121pt_BR
dc.identifier.doihttps://doi.org/10.1039/C9DT00418Apt_BR
dc.identifier.issn1477-9226pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/61418-
dc.description.resumoOptimal processing conditions for fabrication of dense single-phase 6L-Ba2CoTeO6 ceramics via the solid-state reaction method were determined. These ceramics possess a room-temperature crystal structure described by the centrosymmetric P[3 with combining macron]m1 space group. Polarized Raman spectroscopy enabled the observation of all the 25 predicted Raman modes and assignment of their symmetries. On cooling, BCTO ceramics exhibit two antiferromagnetic transitions at 3 K and 12.5 K, in broad agreement with a recent single-crystal study [P. Chanlert, N. Kurita, H. Tanaka, D. Goto, A. Matsuo and K. Kindo, Phys. Rev. B: Condens. Matter Mater. Phys., 2016, 93, 094420]. Low temperature Fourier-transform infrared reflectivity analyses suggest the antiferromagnetic phase transitions to be driven by small distortions of the CoO6 octahedra, lowering locally their C3v symmetry. This causes splitting of the associated vibrational modes, but without a long-range structural change. AC impedance spectroscopy revealed BCTO ceramics to be leaky insulators with an activation energy for conduction of ∼0.15−0.25 eV, which suggests electron hopping between mixed oxidation states of Co.pt_BR
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Geraispt_BR
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetospt_BR
dc.description.sponsorshipOutra Agênciapt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICX - DEPARTAMENTO DE QUÍMICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofDalton Transactionspt_BR
dc.rightsAcesso Restritopt_BR
dc.subjectCeramicspt_BR
dc.subjectSolid-state reactionpt_BR
dc.subjectCentrosymmetricpt_BR
dc.subjectRaman spectroscopypt_BR
dc.subjectAntiferromagnetic transitionspt_BR
dc.subjectFourier-transform infraredpt_BR
dc.subjectActivation energypt_BR
dc.subjectMixed oxidation statespt_BR
dc.subject.otherMaterial cerâmicopt_BR
dc.subject.otherEletrônica do estado sólidopt_BR
dc.subject.otherRaman, Espectroscopia dept_BR
dc.subject.otherAntiferromagnetismopt_BR
dc.subject.otherFourier, Espectroscopia de infravermelho por transformada dept_BR
dc.subject.otherOxidaçãopt_BR
dc.titleSynthesis and characterisation of the vibrational and electrical properties of antiferromagnetic 6l-ba2coteo6 ceramicspt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://pubs.rsc.org/en/content/articlelanding/2019/dt/c9dt00418a#!pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-5664-5703pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-5790-1032pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-2355-6856pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-2355-6856pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7413-1087pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-5038-5621pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6820-0269pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-8151-7009pt_BR
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