Glass forming regions, structure and properties of lanthanum barium germanate and gallate glasses

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dc.contributor.authorCalzavara, Florian
dc.contributor.authorAllix, Mathieu
dc.contributor.authorDussauze, Marc
dc.contributor.authorJubera, Véronique
dc.contributor.authorNalin, Marcelo [UNESP]
dc.contributor.authorCardinal, Thierry
dc.contributor.authorFargin, Evelyne
dc.contributor.institutionUniversité de Bordeaux
dc.contributor.institution1 Avenue de la Recherche Scientifique
dc.contributor.institution351 cours de la Libération
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-28T19:41:41Z
dc.date.available2022-04-28T19:41:41Z
dc.date.issued2021-11-01
dc.description.abstractGlass forming regions in the system GaO3/2 – GeO2 – LaO3/2 – BaO have been explored using aerodynamic levitation coupled to laser heating synthesis technique. Structure property relationships have been established between the thermal and optical properties of the resulting glass thanks to Raman and Infrared vibrational spectroscopies. The germano-gallate glass networks are mainly made of three-dimensional interconnected corner shared GeO4 and GaO4 tetrahedra forming Ge – O – Ge and Ga – O− – Ge bridges in which gallium tetrahedral GaO4 units are charged-compensated by barium and lanthanum cations. In GeO2-rich compositions, the excess of positive charges produces mainly non-bridging oxygens on germanate moieties, leading to a depolymerization of the glass network. In the case of gallium rich compositions, the infrared cut-off is red-shifted as compared to the germanate glasses, in accordance with the disappearance of germanium associated entities such as germanium and gallium bridges or germanium sites with non-bridging oxygen both vibrating at higher wavenumber.en
dc.description.affiliationInstitut de Chimie de la Matière Condensée de Bordeaux Université de Bordeaux, 87 Avenue du Dr Schweitzer
dc.description.affiliationConditions Extrêmes et Matériaux Haute Température et Irradiation UPR3079 Université d'Orléans 1 Avenue de la Recherche Scientifique
dc.description.affiliationInstitut des Sciences Moléculaires UMR 5255 Université́ de Bordeaux 351 cours de la Libération
dc.description.affiliationInstitute of Chemistry São Paulo State University-UNESP Rua Prof. Francisco Degni, 55, CEP 14800-060
dc.description.affiliationUnespInstitute of Chemistry São Paulo State University-UNESP Rua Prof. Francisco Degni, 55, CEP 14800-060
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipHorizon 2020 Framework Programme
dc.description.sponsorshipAgence Nationale de la Recherche
dc.description.sponsorshipIdFAPESP: 2013/07793-6
dc.description.sponsorshipIdFAPESP: 2019/01223-0
dc.description.sponsorshipIdHorizon 2020 Framework Programme: 823941
dc.description.sponsorshipIdAgence Nationale de la Recherche: ANR-10-IDEX-03-02
dc.description.sponsorshipIdAgence Nationale de la Recherche: ANR-18-CE08-0004-02
dc.identifierhttp://dx.doi.org/10.1016/j.jnoncrysol.2021.121064
dc.identifier.citationJournal of Non-Crystalline Solids, v. 571.
dc.identifier.doi10.1016/j.jnoncrysol.2021.121064
dc.identifier.issn0022-3093
dc.identifier.scopus2-s2.0-85110608311
dc.identifier.urihttp://hdl.handle.net/11449/221992
dc.language.isoeng
dc.relation.ispartofJournal of Non-Crystalline Solids
dc.sourceScopus
dc.subjectAerodynamic levitation coupled to laser heating
dc.subjectGermano-gallate glasses
dc.subjectGlass structure
dc.subjectHeavy-metal oxide glasses
dc.subjectVibrational Infrared and Raman spectroscopies
dc.titleGlass forming regions, structure and properties of lanthanum barium germanate and gallate glassesen
dc.typeArtigo

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