Vibrational spectroscopy and intrinsic dielectric properties of Sr2RE8(SiO4)6O2 (RE = rare earth) ceramics

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dc.creatorJéssica Ivone Viegas
dc.creatorSherin Thomas
dc.creatorRafael Nunes Gontijo
dc.creatorAriete Righi
dc.creatorRoberto Luiz Moreira
dc.creatorAnderson Dias
dc.date.accessioned2023-12-20T12:14:25Z
dc.date.accessioned2025-09-09T00:45:32Z
dc.date.available2023-12-20T12:14:25Z
dc.date.issued2022
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.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1016/j.materresbull.2021.111616
dc.identifier.issn0025-5408
dc.identifier.urihttps://hdl.handle.net/1843/62099
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofMaterials Research Bulletin
dc.rightsAcesso Restrito
dc.subjectApatita
dc.subjectCélulas à combustível
dc.subjectRaman, Efeito de
dc.subjectMicroondas - Dielétricos
dc.subjectEspectroscopia de infravermelho
dc.subjectEspectros vibracionais
dc.subjectMaterial cerâmico
dc.subjectDispositivos dielétricos
dc.subjectCompostos de metais de terras raras
dc.subjectTerras raras
dc.subject.otherApatites
dc.subject.otherSr2RE8(SiO4)6O2
dc.subject.otherSolid oxide fuel cells - SOFC
dc.subject.otherMicrowave dielectrics
dc.subject.otherRaman scattering
dc.subject.otherInfrared spectroscopy
dc.titleVibrational spectroscopy and intrinsic dielectric properties of Sr2RE8(SiO4)6O2 (RE = rare earth) ceramics
dc.typeArtigo de periódico
local.citation.spage111616
local.citation.volume146
local.description.resumoThis work reports the vibrational and intrinsic dielectric properties of apatite-type Sr2RE8(SiO4)6O2 (RE = rare earth) ceramics. Raman scattering and infrared-reflectivity spectroscopy were employed under optimized conditions to determine the phonon modes in this series. The results showed good agreement with the theoretical predictions, in which all 33 Raman-active bands and 18 of the 20 predicted polar phonons were visualized and their positions evaluated as a function of the lanthanide ionic radii under investigation. Dispersion analyses were conducted in all Sr2RE8(SiO4)6O2 ceramics using the Lorentz model and Kramers-Krönig relations to obtain the infrared optical functions and polar phonon characteristics of the materials, from which their intrinsic dielectric properties were calculated. The relationships between the intrinsic properties obtained by infrared spectroscopy and the extrinsic properties determined by direct microwave measurements (postresonator method and resonant cavity procedures), as well as with the values predicted by the Clausius-Mossotti equation were discussed.
local.identifier.orcidhttps://orcid.org/0000-0002-4865-5052
local.identifier.orcidhttps://orcid.org/0000-0002-6335-483X
local.identifier.orcidhttps://orcid.org/0000-0002-6939-9369
local.identifier.orcidhttps://orcid.org/0000-0001-8752-9609
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
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/S002554082100413X

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