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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/57221
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dc.creatorAnderson Diaspt_BR
dc.creatorJéssica Ivone Viegaspt_BR
dc.creatorRoberto Luiz Moreirapt_BR
dc.date.accessioned2023-07-31T14:47:23Z-
dc.date.available2023-07-31T14:47:23Z-
dc.date.issued2017-
dc.citation.volume725pt_BR
dc.citation.spage77pt_BR
dc.citation.epage83pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.jallcom.2017.07.155pt_BR
dc.identifier.issn0925-8388pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/57221-
dc.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.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.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_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 FÍSICApt_BR
dc.publisher.departmentICX - DEPARTAMENTO DE QUÍMICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofJournal of Alloys and Compoundspt_BR
dc.rightsAcesso Restritopt_BR
dc.subjectCeramicspt_BR
dc.subjectRaman scatteringpt_BR
dc.subjectRuddlesden-Popper phasespt_BR
dc.subjectLanthanidespt_BR
dc.subjectDielectric resonatorspt_BR
dc.subject.otherMaterial cerâmicopt_BR
dc.subject.otherDispositivos dieletricospt_BR
dc.subject.otherMetais de terras raraspt_BR
dc.subject.otherRaman, Efeito dept_BR
dc.subject.otherEspectroscopia de infravermelhopt_BR
dc.titleSynthesis and μ-Raman scattering of Ruddlesden-Popper ceramics Sr3Ti2O7, SrLa2Al2O7 and Sr2LaAlTiO7pt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.sciencedirect.com/science/article/pii/S0925838817325318pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7413-1087pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-4865-5052pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6820-0269pt_BR
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