Raman and infrared spectroscopic studies of LaTaTiO6 polymorphs

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dc.creatorRoberto Luiz Moreira
dc.creatorJéssica Ivone Viegas
dc.creatorAnderson Dias
dc.date.accessioned2023-08-03T19:32:24Z
dc.date.accessioned2025-09-09T00:49:23Z
dc.date.available2023-08-03T19:32:24Z
dc.date.issued2017
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.description.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1016/j.jallcom.2017.03.291
dc.identifier.issn0925-8388
dc.identifier.urihttps://hdl.handle.net/1843/57432
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofJournal of Alloys and Compounds
dc.rightsAcesso Restrito
dc.subjectMaterial cerâmico
dc.subjectRaman, Efeito de
dc.subjectMetais de terras raras
dc.subjectEspectroscopia de infravermelho
dc.subjectDispositivos dielétricos
dc.subjectRessonadores
dc.subjectRaios X - Difração
dc.subject.otherCeramics
dc.subject.otherRaman scattering
dc.subject.otherLanthanides
dc.subject.otherInfrared spectroscopy
dc.subject.otherDielectric resonators
dc.titleRaman and infrared spectroscopic studies of LaTaTiO6 polymorphs
dc.typeArtigo de periódico
local.citation.epage615
local.citation.spage608
local.citation.volume710
local.description.resumoX-ray diffraction, Raman scattering and infrared spectroscopy were used to investigate the orthorhombic-to-monoclinic polymorphic transformation of LaTaTiO6 ceramics, induced at high temperatures. For sake of comparison, LnTaTiO6 ceramics for various lanthanides (Ln), including La, were prepared by the solid-state reaction method. Phase-pure orthorhombic (Pnma space group) and monoclinic (C2/c space group) structures were obtained for LaTaTiO6 at sintering temperatures of 1300 °C and 1400 °C, respectively. The Raman spectrum of the orthorhombic LaTaTiO6 appeared to be very close to that of PrTaTiO6, which crystallizes within the aeschynite structure. Raman and infrared spectra of monoclinic LaTaTiO6 ceramics are reported for the first time. Polarized Raman spectroscopy allowed determining (and assigning) all the non-polar modes of the material into the C2/c monoclinic phase. Infrared reflectivity spectra revealed the main polar modes that contribute to the dielectric response. The intrinsic dielectric parameters obtained by this procedure match well with those found by microwave techniques in ceramics prepared at relatively high sintering temperatures – which must belong to the described monoclinic structure.
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.identifier.orcidhttps://orcid.org/0000-0002-4865-5052
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0925838817310939

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