Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics

Detalhes bibliográficos
Autor(a) principal: Nascimento Guedes, Luis Felipe
Data de Publicação: 2020
Outros Autores: Marcondes, Lia Mara [UNESP], Evangelista, Renato Oliveira, Batista, Gislene, Mendoza, Valentina Gacha, Cassanjes, Fabia Castro, Poirier, Gael Yves
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.optmat.2020.109866
http://hdl.handle.net/11449/195433
Resumo: Alkali niobium germanate glasses were prepared by melt-quenching in the ternary systems 75GeO(2)-15Nb(2)O(5)-10M(2)O with M = Li, Na, K, Rb and Cs. Thermal properties of these glasses and related glass-ceramics are strongly dependent on the alkaline modifier. Structural investigations by Raman allowed to determine that the alkali radius has an influence on the number of non-bridging oxygens and consequently on the average glass network connectivity. Raman spectra of sodium, potassium and rubidium germanate glass-ceramics exhibited slight changes when compared to the pristine glass and the new Raman features can be attributed to a 3D NbO6 network similar to orthorhombic niobium oxide. Characterization of the heat-treated glasses allowed to determine the crystalline phases precipitated in the samples and it has been shown that a single perovskite bronze-like phase of general formula M2Nb5O21 can be obtained in Na, K, and Rb-containing glasses. Luminescent properties of Eu3+-doped glasses pointed out a non-regular tendency where sodium-based glass seems to be the inflexion point of luminescent data with higher asymmetry around Eu3+ ions and higher quantum efficiency. In transparent glass-ceramics, the Eu3+ luminescent properties are clearly modified in the Na- and K-based samples with lower symmetry and quantum efficiency after heat-treatment. Such optical behavior is attributed to Eu3+ migration in the perovskite crystalline phase with highly distorted Eu3+ sites and shorter Eu3+-Eu3+ distances.
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spelling Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramicsGlassGlass-ceramicGermanateNiobiumAlkaliAlkali niobium germanate glasses were prepared by melt-quenching in the ternary systems 75GeO(2)-15Nb(2)O(5)-10M(2)O with M = Li, Na, K, Rb and Cs. Thermal properties of these glasses and related glass-ceramics are strongly dependent on the alkaline modifier. Structural investigations by Raman allowed to determine that the alkali radius has an influence on the number of non-bridging oxygens and consequently on the average glass network connectivity. Raman spectra of sodium, potassium and rubidium germanate glass-ceramics exhibited slight changes when compared to the pristine glass and the new Raman features can be attributed to a 3D NbO6 network similar to orthorhombic niobium oxide. Characterization of the heat-treated glasses allowed to determine the crystalline phases precipitated in the samples and it has been shown that a single perovskite bronze-like phase of general formula M2Nb5O21 can be obtained in Na, K, and Rb-containing glasses. Luminescent properties of Eu3+-doped glasses pointed out a non-regular tendency where sodium-based glass seems to be the inflexion point of luminescent data with higher asymmetry around Eu3+ ions and higher quantum efficiency. In transparent glass-ceramics, the Eu3+ luminescent properties are clearly modified in the Na- and K-based samples with lower symmetry and quantum efficiency after heat-treatment. Such optical behavior is attributed to Eu3+ migration in the perovskite crystalline phase with highly distorted Eu3+ sites and shorter Eu3+-Eu3+ distances.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)FINEPCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Univ Fed Alfenas, Grp Quim Mat, Campus Pocos De Caldas, Pocos De Caldas, MG, BrazilUniv Estadual Paulista, Inst Quim, Araraquara, SP, BrazilUniv Estadual Paulista, Inst Quim, Araraquara, SP, BrazilCNPq: 156420/2018-0Elsevier B.V.Univ Fed AlfenasUniversidade Estadual Paulista (Unesp)Nascimento Guedes, Luis FelipeMarcondes, Lia Mara [UNESP]Evangelista, Renato OliveiraBatista, GisleneMendoza, Valentina GachaCassanjes, Fabia CastroPoirier, Gael Yves2020-12-10T17:34:30Z2020-12-10T17:34:30Z2020-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article8http://dx.doi.org/10.1016/j.optmat.2020.109866Optical Materials. Amsterdam: Elsevier, v. 105, 8 p., 2020.0925-3467http://hdl.handle.net/11449/19543310.1016/j.optmat.2020.109866WOS:000539377300011Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengOptical Materialsinfo:eu-repo/semantics/openAccess2021-10-23T08:11:03Zoai:repositorio.unesp.br:11449/195433Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:50:14.574455Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics
title Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics
spellingShingle Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics
Nascimento Guedes, Luis Felipe
Glass
Glass-ceramic
Germanate
Niobium
Alkali
title_short Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics
title_full Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics
title_fullStr Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics
title_full_unstemmed Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics
title_sort Effect of alkaline modifiers on the structural, optical and crystallization properties of niobium germanate glasses and glass-ceramics
author Nascimento Guedes, Luis Felipe
author_facet Nascimento Guedes, Luis Felipe
Marcondes, Lia Mara [UNESP]
Evangelista, Renato Oliveira
Batista, Gislene
Mendoza, Valentina Gacha
Cassanjes, Fabia Castro
Poirier, Gael Yves
author_role author
author2 Marcondes, Lia Mara [UNESP]
Evangelista, Renato Oliveira
Batista, Gislene
Mendoza, Valentina Gacha
Cassanjes, Fabia Castro
Poirier, Gael Yves
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Univ Fed Alfenas
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Nascimento Guedes, Luis Felipe
Marcondes, Lia Mara [UNESP]
Evangelista, Renato Oliveira
Batista, Gislene
Mendoza, Valentina Gacha
Cassanjes, Fabia Castro
Poirier, Gael Yves
dc.subject.por.fl_str_mv Glass
Glass-ceramic
Germanate
Niobium
Alkali
topic Glass
Glass-ceramic
Germanate
Niobium
Alkali
description Alkali niobium germanate glasses were prepared by melt-quenching in the ternary systems 75GeO(2)-15Nb(2)O(5)-10M(2)O with M = Li, Na, K, Rb and Cs. Thermal properties of these glasses and related glass-ceramics are strongly dependent on the alkaline modifier. Structural investigations by Raman allowed to determine that the alkali radius has an influence on the number of non-bridging oxygens and consequently on the average glass network connectivity. Raman spectra of sodium, potassium and rubidium germanate glass-ceramics exhibited slight changes when compared to the pristine glass and the new Raman features can be attributed to a 3D NbO6 network similar to orthorhombic niobium oxide. Characterization of the heat-treated glasses allowed to determine the crystalline phases precipitated in the samples and it has been shown that a single perovskite bronze-like phase of general formula M2Nb5O21 can be obtained in Na, K, and Rb-containing glasses. Luminescent properties of Eu3+-doped glasses pointed out a non-regular tendency where sodium-based glass seems to be the inflexion point of luminescent data with higher asymmetry around Eu3+ ions and higher quantum efficiency. In transparent glass-ceramics, the Eu3+ luminescent properties are clearly modified in the Na- and K-based samples with lower symmetry and quantum efficiency after heat-treatment. Such optical behavior is attributed to Eu3+ migration in the perovskite crystalline phase with highly distorted Eu3+ sites and shorter Eu3+-Eu3+ distances.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-10T17:34:30Z
2020-12-10T17:34:30Z
2020-07-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.optmat.2020.109866
Optical Materials. Amsterdam: Elsevier, v. 105, 8 p., 2020.
0925-3467
http://hdl.handle.net/11449/195433
10.1016/j.optmat.2020.109866
WOS:000539377300011
url http://dx.doi.org/10.1016/j.optmat.2020.109866
http://hdl.handle.net/11449/195433
identifier_str_mv Optical Materials. Amsterdam: Elsevier, v. 105, 8 p., 2020.
0925-3467
10.1016/j.optmat.2020.109866
WOS:000539377300011
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Optical Materials
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 8
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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