Preparation, characterization, and structural studies of new sodium gallium tungstate phosphate glasses
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , , |
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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Repositório Institucional da UNESP |
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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) |
repository.mail.fl_str_mv |
|
_version_ |
1808129424714891264 |