Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses

Detalhes bibliográficos
Autor(a) principal: Lodi, Thiago A.
Data de Publicação: 2023
Outros Autores: Galleani, Gustavo, Junior, Marcos de Oliveira, Santagneli, Silvia H. [UNESP], Eckert, Hellmut, de Camargo, Andrea S.S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.jnoncrysol.2022.122100
http://hdl.handle.net/11449/246530
Resumo: A new glass forming region in the quaternary system Na2O-P2O5-WO3-Ga2O3 along the composition line (NaPO3)80-x(Ga2O3)20(Na2WO4)x (x = 0, 5, 10, 15, 20 and 25 mol%) has been prepared and characterized by X-ray diffraction, Differential Scanning Calorimetry (DSC), Raman scattering and 31P, 23Na and 71Ga nuclear magnetic single and double resonance NMR techniques. The partial substitution of the NaPO3 component by Na2WO4 produces a significant increase of molar volume (decreased oxygen packing density), whereas the glass transition temperatures Tg pass through a shallow maximum near x = 10 to 15. While in the x = 0 sample the structure is dominated by Q1 units linked to gallium in four-, five- and six-coordination, the gradual substitution of phosphate by tungstate significantly affects network reconstruction, eliminating P-O-P linkages, the concentration of which is found to be greatly diminished above the x = 10 level. While the structure of these glasses is dominated by Q0 units, connected to both gallium and tungstate species, 71Ga{31P} REDOR data suggest significant decreases in the extent of gallium-phosphorus connectivity with increasing Na2WO4 content. Finally, monotonic changes in both 23Na chemical shifts and 23Na-31P second moment values, M2(Na-P), indicate that the anionic surroundings of the sodium ions evolve from a pure phosphate to a mixed phosphate/tungstate environment.
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spelling Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glassesA new glass forming region in the quaternary system Na2O-P2O5-WO3-Ga2O3 along the composition line (NaPO3)80-x(Ga2O3)20(Na2WO4)x (x = 0, 5, 10, 15, 20 and 25 mol%) has been prepared and characterized by X-ray diffraction, Differential Scanning Calorimetry (DSC), Raman scattering and 31P, 23Na and 71Ga nuclear magnetic single and double resonance NMR techniques. The partial substitution of the NaPO3 component by Na2WO4 produces a significant increase of molar volume (decreased oxygen packing density), whereas the glass transition temperatures Tg pass through a shallow maximum near x = 10 to 15. While in the x = 0 sample the structure is dominated by Q1 units linked to gallium in four-, five- and six-coordination, the gradual substitution of phosphate by tungstate significantly affects network reconstruction, eliminating P-O-P linkages, the concentration of which is found to be greatly diminished above the x = 10 level. While the structure of these glasses is dominated by Q0 units, connected to both gallium and tungstate species, 71Ga{31P} REDOR data suggest significant decreases in the extent of gallium-phosphorus connectivity with increasing Na2WO4 content. Finally, monotonic changes in both 23Na chemical shifts and 23Na-31P second moment values, M2(Na-P), indicate that the anionic surroundings of the sodium ions evolve from a pure phosphate to a mixed phosphate/tungstate environment.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)São Carlos Institute of Physics University of São Paulo, Av. Trabalhador Saocarlense 400, SPInstitute of Chemistry São Paulo State University/UNESP, Prof. Francisco Degni, 55, SPInstitute of Chemistry São Paulo State University/UNESP, Prof. Francisco Degni, 55, SPFAPESP: 2013/07793-6FAPESP: 2018/03931-9CNPq: 310870/2020-8CNPq: 311069/2020-7CNPq: 311828/2021-3Universidade de São Paulo (USP)Universidade Estadual Paulista (UNESP)Lodi, Thiago A.Galleani, GustavoJunior, Marcos de OliveiraSantagneli, Silvia H. [UNESP]Eckert, Hellmutde Camargo, Andrea S.S.2023-07-29T12:43:34Z2023-07-29T12:43:34Z2023-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jnoncrysol.2022.122100Journal of Non-Crystalline Solids, v. 603.0022-3093http://hdl.handle.net/11449/24653010.1016/j.jnoncrysol.2022.1221002-s2.0-85144631908Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Non-Crystalline Solidsinfo:eu-repo/semantics/openAccess2023-07-29T12:43:34Zoai:repositorio.unesp.br:11449/246530Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:24:36.902213Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
title Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
spellingShingle Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
Lodi, Thiago A.
title_short Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
title_full Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
title_fullStr Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
title_full_unstemmed Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
title_sort Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
author Lodi, Thiago A.
author_facet Lodi, Thiago A.
Galleani, Gustavo
Junior, Marcos de Oliveira
Santagneli, Silvia H. [UNESP]
Eckert, Hellmut
de Camargo, Andrea S.S.
author_role author
author2 Galleani, Gustavo
Junior, Marcos de Oliveira
Santagneli, Silvia H. [UNESP]
Eckert, Hellmut
de Camargo, Andrea S.S.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade de São Paulo (USP)
Universidade Estadual Paulista (UNESP)
dc.contributor.author.fl_str_mv Lodi, Thiago A.
Galleani, Gustavo
Junior, Marcos de Oliveira
Santagneli, Silvia H. [UNESP]
Eckert, Hellmut
de Camargo, Andrea S.S.
description A new glass forming region in the quaternary system Na2O-P2O5-WO3-Ga2O3 along the composition line (NaPO3)80-x(Ga2O3)20(Na2WO4)x (x = 0, 5, 10, 15, 20 and 25 mol%) has been prepared and characterized by X-ray diffraction, Differential Scanning Calorimetry (DSC), Raman scattering and 31P, 23Na and 71Ga nuclear magnetic single and double resonance NMR techniques. The partial substitution of the NaPO3 component by Na2WO4 produces a significant increase of molar volume (decreased oxygen packing density), whereas the glass transition temperatures Tg pass through a shallow maximum near x = 10 to 15. While in the x = 0 sample the structure is dominated by Q1 units linked to gallium in four-, five- and six-coordination, the gradual substitution of phosphate by tungstate significantly affects network reconstruction, eliminating P-O-P linkages, the concentration of which is found to be greatly diminished above the x = 10 level. While the structure of these glasses is dominated by Q0 units, connected to both gallium and tungstate species, 71Ga{31P} REDOR data suggest significant decreases in the extent of gallium-phosphorus connectivity with increasing Na2WO4 content. Finally, monotonic changes in both 23Na chemical shifts and 23Na-31P second moment values, M2(Na-P), indicate that the anionic surroundings of the sodium ions evolve from a pure phosphate to a mixed phosphate/tungstate environment.
publishDate 2023
dc.date.none.fl_str_mv 2023-07-29T12:43:34Z
2023-07-29T12:43:34Z
2023-03-01
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.jnoncrysol.2022.122100
Journal of Non-Crystalline Solids, v. 603.
0022-3093
http://hdl.handle.net/11449/246530
10.1016/j.jnoncrysol.2022.122100
2-s2.0-85144631908
url http://dx.doi.org/10.1016/j.jnoncrysol.2022.122100
http://hdl.handle.net/11449/246530
identifier_str_mv Journal of Non-Crystalline Solids, v. 603.
0022-3093
10.1016/j.jnoncrysol.2022.122100
2-s2.0-85144631908
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Non-Crystalline Solids
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
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)
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