Raman and infrared spectroscopic investigations of a ferroelastic phase transition in Ba2ZnTeO6 double perovskite

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dc.creatorRoberto Luiz Moreira
dc.creatorRicardo P. S. M. Lobo
dc.creatorSérgio L. L. M. Ramos
dc.creatorMailadil Thomas Sebastian
dc.creatorFranklin Massami Matinaga
dc.creatorAriete Righi
dc.creatorAnderson Dias
dc.date.accessioned2023-06-27T19:33:29Z
dc.date.accessioned2025-09-09T00:18:46Z
dc.date.available2023-06-27T19:33:29Z
dc.date.issued2018
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.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetos
dc.identifier.doihttps://doi.org/10.1103/PhysRevMaterials.2.054406
dc.identifier.issn2475-9953
dc.identifier.urihttps://hdl.handle.net/1843/55437
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofPhysical Review Materials
dc.rightsAcesso Restrito
dc.subjectEspalhamento
dc.subjectTransições de fases
dc.subjectEspectroscopia de Raman
dc.subject.otherRaman spectroscopy
dc.subject.otherFerroelastic phase transition
dc.subject.otherRaman scattering
dc.titleRaman and infrared spectroscopic investigations of a ferroelastic phase transition in Ba2ZnTeO6 double perovskite
dc.typeArtigo de periódico
local.citation.epage054406-11
local.citation.issue5
local.citation.spage054406-1
local.citation.volume2
local.description.resumoThe low-temperature vibrational properties of Ba2 ZnTeO6 double-perovskite ceramics obtained by the solid-state route were investigated by Raman scattering and Fourier-transform infrared reflectivity. We found that this material undergoes a reversible ferroelastic phase transition at around 140 K, well compatible with a recently proposed rhombohedral-to-monoclinic structural change that would occur below 165 K. Complementary calorimetric measurements showed that the phase transition has a first-order character, with an entropy jump compatible with a displacive mechanism. The vibrational spectra show clearly the splitting of the doubly degenerate E modes into nondegenerate representations of the low-symmetry phase. In particular, the lowest-frequency Raman mode presents soft-mode behavior and splits below the critical temperature, confirming the in-plane ferroelastic deformation in the low temperature phase.
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.identifier.orcidhttps://orcid.org/0000-0003-2355-6856
local.identifier.orcidhttps://orcid.org/0000-0002-0507-2471
local.identifier.orcidhttps://orcid.org/0000-0001-8752-9609
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.2.054406

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