Synthesis and μ-Raman scattering of Ruddlesden-Popper ceramics Sr3Ti2O7, SrLa2Al2O7 and Sr2LaAlTiO7

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dc.creatorAnderson Dias
dc.creatorJéssica Ivone Viegas
dc.creatorRoberto Luiz Moreira
dc.date.accessioned2023-07-31T14:47:23Z
dc.date.accessioned2025-09-08T23:25:51Z
dc.date.available2023-07-31T14:47:23Z
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.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1016/j.jallcom.2017.07.155
dc.identifier.issn0925-8388
dc.identifier.urihttps://hdl.handle.net/1843/57221
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofJournal of Alloys and Compounds
dc.rightsAcesso Restrito
dc.subjectMaterial cerâmico
dc.subjectDispositivos dieletricos
dc.subjectMetais de terras raras
dc.subjectRaman, Efeito de
dc.subjectEspectroscopia de infravermelho
dc.subject.otherCeramics
dc.subject.otherRaman scattering
dc.subject.otherRuddlesden-Popper phases
dc.subject.otherLanthanides
dc.subject.otherDielectric resonators
dc.titleSynthesis and μ-Raman scattering of Ruddlesden-Popper ceramics Sr3Ti2O7, SrLa2Al2O7 and Sr2LaAlTiO7
dc.typeArtigo de periódico
local.citation.epage83
local.citation.spage77
local.citation.volume725
local.description.resumoRuddlesden-Popper Sr3Ti2O7, SrLa2Al2O7 and Sr2LaAlTiO7 ceramics were synthesized by microwave-assisted hydrothermal method or solid-state reactions. Single-phase, impurity free materials were obtained, which belong to the tetragonal I4/mmm (#139) space group. μ-Raman spectroscopy and group-theory calculations were carried out to study the vibrational features of these ceramics. For Sr3Ti2O7, first-order, second-order, defect-induced and infrared-active modes were simultaneously observed in the Raman spectra. It was possible to discern among these different types of modes, thus determining 9 of the 10 first-order modes predicted by group-theory. SrLa2Al2O7 and Sr2LaAlTiO7 ceramics presented complex Raman spectra, which were deconvoluted by Lorentzian curves. Eleven and fourteen Raman modes could be adjusted, respectively, in excellent agreement with the theoretical predictions, since 12 bands are expected for SrLa2Al2O7, while 14 Raman modes are predicted for Sr2LaAlTiO7. Polarized spectra were also obtained for Sr2LaAlTiO7 ceramics, which allowed us to discern between the A1g/B1g and the Eg modes. Our results complement the previous studies by infrared spectroscopy, and contribute to the knowledge of the optical vibrational behavior of these materials, fundamental to understand and improve their properties for microwave applications.
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.identifier.orcidhttps://orcid.org/0000-0002-4865-5052
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
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/S0925838817325318

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