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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/62086
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dc.creatorGuilherme Mendes Martinspt_BR
dc.creatorCristiano Fantini Leitept_BR
dc.creatorRoberto Luiz Moreirapt_BR
dc.creatorAnderson Diaspt_BR
dc.date.accessioned2023-12-19T14:39:42Z-
dc.date.available2023-12-19T14:39:42Z-
dc.date.issued2021-
dc.citation.volume47pt_BR
dc.citation.issue11pt_BR
dc.citation.spage15202pt_BR
dc.citation.epage15209pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.ceramint.2021.02.082pt_BR
dc.identifier.issn0272-8842pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/62086-
dc.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.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.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.ispartofCeramics International-
dc.rightsAcesso Restritopt_BR
dc.subjectPolymorphismpt_BR
dc.subjectRare-earthspt_BR
dc.subjectGermanatespt_BR
dc.subjectRaman spectroscopypt_BR
dc.subjectReflectancept_BR
dc.subjectUVVis spectroscopypt_BR
dc.subjectOptical-vibration propertiespt_BR
dc.subject.otherPolimorfismo (Cristalografia)pt_BR
dc.subject.otherTerras raraspt_BR
dc.subject.otherRaman, Espectroscopia dept_BR
dc.subject.otherEspectrometria de ultra violetapt_BR
dc.subject.otherEspectros vibracionaispt_BR
dc.subject.otherMetais de terras raraspt_BR
dc.subject.otherFotoluminescênciapt_BR
dc.subject.otherCompostos de lantâniopt_BR
dc.titlePolymorphism in Gd2Ge2O7 ceramics: structural, vibrational, and optical featurespt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.sciencedirect.com/science/article/pii/S0272884221004302pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7620-6708pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-0436-7857pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6820-0269pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7413-1087pt_BR
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