Synthesis and characterisation of the vibrational and electrical properties of antiferromagnetic 6l-ba2coteo6 ceramics

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dc.creatorAnees Abdul Aziz
dc.creatorSilvana Mercone
dc.creatorRicardo P. S. M. Lobo
dc.creatorAnderson Dias
dc.creatorRoberto Luiz Moreira
dc.creatorAnthony Martin Thomas Bell
dc.creatorRoger Eccleston
dc.creatorAntonio Feteira
dc.date.accessioned2023-11-27T20:04:18Z
dc.date.accessioned2025-09-09T01:09:53Z
dc.date.available2023-11-27T20:04:18Z
dc.date.issued2019
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetos
dc.description.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1039/C9DT00418A
dc.identifier.issn1477-9226
dc.identifier.urihttps://hdl.handle.net/1843/61418
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofDalton Transactions
dc.rightsAcesso Restrito
dc.subjectMaterial cerâmico
dc.subjectEletrônica do estado sólido
dc.subjectRaman, Espectroscopia de
dc.subjectAntiferromagnetismo
dc.subjectFourier, Espectroscopia de infravermelho por transformada de
dc.subjectOxidação
dc.subject.otherCeramics
dc.subject.otherSolid-state reaction
dc.subject.otherCentrosymmetric
dc.subject.otherRaman spectroscopy
dc.subject.otherAntiferromagnetic transitions
dc.subject.otherFourier-transform infrared
dc.subject.otherActivation energy
dc.subject.otherMixed oxidation states
dc.titleSynthesis and characterisation of the vibrational and electrical properties of antiferromagnetic 6l-ba2coteo6 ceramics
dc.typeArtigo de periódico
local.citation.epage11121
local.citation.spage11112
local.citation.volume48
local.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.
local.identifier.orcidhttps://orcid.org/0000-0001-5664-5703
local.identifier.orcidhttps://orcid.org/0000-0002-5790-1032
local.identifier.orcidhttps://orcid.org/0000-0003-2355-6856
local.identifier.orcidhttps://orcid.org/0000-0003-2355-6856
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.identifier.orcidhttps://orcid.org/0000-0001-5038-5621
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.identifier.orcidhttps://orcid.org/0000-0001-8151-7009
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://pubs.rsc.org/en/content/articlelanding/2019/dt/c9dt00418a#!

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