Structural and luminescence characterization of europium-doped niobium germanate glasses and glass-ceramics: Novel insights from 93Nb solid-state NMR spectroscopy

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade Federal de São Carlos (UFSCar)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Federal de Alfenas-
Autor(es): dc.creatorMarcondes, Lia Mara-
Autor(es): dc.creatorBradtmüller, Henrik-
Autor(es): dc.creatorSantos, Sabrina Nicoleti Carvalho dos-
Autor(es): dc.creatorNolasco, Lucas Konaka-
Autor(es): dc.creatorMendonça, Cleber Renato-
Autor(es): dc.creatorSantagneli, Silvia Helena-
Autor(es): dc.creatorPoirier, Gael Yves-
Autor(es): dc.creatorNalin, Marcelo-
Data de aceite: dc.date.accessioned2025-08-21T22:14:56Z-
Data de disponibilização: dc.date.available2025-08-21T22:14:56Z-
Data de envio: dc.date.issued2023-03-01-
Data de envio: dc.date.issued2023-03-01-
Data de envio: dc.date.issued2022-07-15-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.ceramint.2022.04.062-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/239860-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/239860-
Descrição: dc.descriptionA thorough understanding of network former roles in optical glasses and glass-ceramics, as well as structural environments of luminescent rare-earth atoms, is paramount to assessing their suitability and effectiveness as components for fully-optical integrated devices. The present contribution sheds light on the overall poorly understood structural role of Nb2O5 in oxide glasses and offers a rationale for the luminescence changes concomitant to the heat-treatment induced glass-to-crystal transition in niobium germanate glasses. To this end, results from 93Nb nuclear magnetic resonance (NMR), Raman, and Eu3+ ion based luminescence spectroscopies as well as 3D micromanufacturing are reported for glasses and glass-ceramics in system (89.9-x)GeO2-xNb2O5-10K2O-0.1Eu2O3. Thanks to very-fast 93Nb magic-angle spinning (MAS) and a novel excitation scheme for Triple-quantum (TQ)MAS solid-state NMR spectroscopy distinct Nb(OGe)6-y(ONb)y species were identified for the first time: at low Nb concentrations structural units with rather low y-values are formed, reaching down to isolated Nb(OGe)6 units – next to units bearing non-bridging oxygen atoms; at intermediate Nb contents and beyond, structural units with increasingly higher y-values up to Nb(ONb)6 are found, resembling the local environments found in crystalline Nb2O5. After the glass-to-crystal transition the Nb local environment maintains a high degree of disorder while some residual glass remains. Moreover, photoluminescence spectroscopy of the europium probes suggests the rare-earth ions are preferentially incorporated into high y-value Nb(OGe)6-y(ONb)y polyhedra based on spectral features such as the phonon sideband, the 5D0 → 7F2/7F1 ratio, and split 4f bands. Finally, femtosecond laser microfabrication of waveguides was successful in the presented europium-doped niobium germanate glasses, making them promising candidates for further studies as photonic devices.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionInstituto de Química Universidade Estadual Paulista Júlio de Mendonça Filho, SP-
Descrição: dc.descriptionDepartamento de Engenharia de Materiais Universidade Federal de São Carlos, SP-
Descrição: dc.descriptionInstituto de Física de São Carlos Universidade de São Paulo, SP-
Descrição: dc.descriptionGrupo de Química de Materiais Universidade Federal de Alfenas Campus Poços de Caldas, MG-
Descrição: dc.descriptionInstituto de Química Universidade Estadual Paulista Júlio de Mendonça Filho, SP-
Descrição: dc.descriptionCNPq: 156420/2018-0-
Descrição: dc.descriptionFAPESP: 2013/07793-6-
Descrição: dc.descriptionFAPESP: 2019/26399-3-
Descrição: dc.descriptionFAPESP: 2020/01786-1-
Formato: dc.format20801-20808-
Idioma: dc.languageen-
Relação: dc.relationCeramics International-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subject93Nb solid-state NMR-
Palavras-chave: dc.subjectEuropium probe-
Palavras-chave: dc.subjectGlass crystallization-
Palavras-chave: dc.subjectPhotonic waveguides-
Título: dc.titleStructural and luminescence characterization of europium-doped niobium germanate glasses and glass-ceramics: Novel insights from 93Nb solid-state NMR spectroscopy-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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