Polymorphism in Gd2Ge2O7 ceramics: structural, vibrational, and optical features

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dc.creatorGuilherme Mendes Martins
dc.creatorCristiano Fantini Leite
dc.creatorRoberto Luiz Moreira
dc.creatorAnderson Dias
dc.date.accessioned2023-12-19T14:39:42Z
dc.date.accessioned2025-09-09T00:50:14Z
dc.date.available2023-12-19T14:39:42Z
dc.date.issued2021
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.identifier.doihttps://doi.org/10.1016/j.ceramint.2021.02.082
dc.identifier.issn0272-8842
dc.identifier.urihttps://hdl.handle.net/1843/62086
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofCeramics International
dc.rightsAcesso Restrito
dc.subjectPolimorfismo (Cristalografia)
dc.subjectTerras raras
dc.subjectRaman, Espectroscopia de
dc.subjectEspectrometria de ultra violeta
dc.subjectEspectros vibracionais
dc.subjectMetais de terras raras
dc.subjectFotoluminescência
dc.subjectCompostos de lantânio
dc.subject.otherPolymorphism
dc.subject.otherRare-earths
dc.subject.otherGermanates
dc.subject.otherRaman spectroscopy
dc.subject.otherReflectance
dc.subject.otherUVVis spectroscopy
dc.subject.otherOptical-vibration properties
dc.titlePolymorphism in Gd2Ge2O7 ceramics: structural, vibrational, and optical features
dc.typeArtigo de periódico
local.citation.epage15209
local.citation.issue11
local.citation.spage15202
local.citation.volume47
local.description.resumoIn this work, Gd2Ge2O7 polymorphs were obtained by solid-state reactions at 1100–1300 °C. Structural and vibrational features were investigated by X-ray diffraction and Raman spectroscopy. For the triclinic (space group P1) polymorph, all the predicted phonons were discerned in perfect agreement with the group theory calculations, while for the tetragonal polymorph (space group P41212), 53 bands of the 81 predicted modes could be identified and characterized. The Gd3+ 4f-4f electronic transitions were investigated by diffuse reflectance spectroscopy in the range 200–340 nm. By applying the Kubelka-Munk function, it was possible to determine the bandgap values for all ceramics studied. The tetragonal polymorph exhibited higher bandgap values (5.88 eV) than the triclinic one (5.59 eV), which are both more energetic than other pyrochlore polymorphs reported in the literature. The results indicate that the presence of polymorphism in Gd2Ge2O7 ceramics can be used to produce tailor-made materials since their crystal structures have a strong influence on their optical properties. Consequently, these properties could be used to tuning the optical properties of Gd-containing materials to sensitize and transfer energy to other luminescent lanthanide ions, aiming for innovative applications.
local.identifier.orcidhttps://orcid.org/0000-0001-7620-6708
local.identifier.orcidhttps://orcid.org/0000-0003-0436-7857
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/S0272884221004302

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