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Spherulitic crystallization of quartz-like GeO2 and correlated second harmonic generation in sodium tantalum germanate glasses

hal.structure.identifierInstituto de Ciência e Tecnologia
dc.contributor.authorOLIVEIRA EVANGELISTA, Renato
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCARDINAL, Thierry
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFARGIN, Evelyne
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBUFFIERE, Sonia
hal.structure.identifierPlateforme Aquitaine de Caractérisation des Matériaux [PLACAMAT]
dc.contributor.authorCAM, Nithavong
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorDUSSAUZE, Marc
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorRODRIGUEZ, Vincent
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorADAMIETZ, Frederic
hal.structure.identifierInstituto de Ciência e Tecnologia
dc.contributor.authorMARCONDES, Lia
hal.structure.identifierInstituto de Ciência e Tecnologia
dc.contributor.authorBATISTA, Gislene
hal.structure.identifierInstituto de Ciência e Tecnologia
dc.contributor.authorCASTRO CASSANJES, Fabia
hal.structure.identifierInstituto de Ciência e Tecnologia
dc.contributor.authorPOIRIER, Gael
dc.date.issued2021
dc.identifier.issn0925-8388
dc.description.abstractEnComplex sequential crystallization mechanisms were investigated in the glass composition 70GeO2-10Na2O-20Ta2O5 prepared by melt-quenching. In a first stage, a classical volume-nucleated crystallization of sodium tantalate perovskite Na2Ta8O21 is induced under short time heat-treatments whereas longer annealing treatments promote the formation of surface spherical structures known as spherulites. These singular glass-ceramics were deeply investigated by density measurements, differential scanning calorimetry (DSC), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), Auger Electron Spectroscopy (EDS), correlated Raman and second harmonic generation (SHG) microscopy as well as macro-SHG measurements. These surface spherulites with average size up to 50 µm are richer in tantalum but poorer in germanium than the surrounding material. However, measured SHG signals were found to be related to quartz-like α-GeO2 grown inside the spherulites. Therefore these materials exhibit a second-order non-linear optical response, related to the symmetry of the point group D3 given by the quartz GeO2 grown for the first time in a transparent glass-ceramic.
dc.description.sponsorshipInitiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
dc.language.isoen
dc.publisherElsevier
dc.subject.enα-GeO2
dc.subject.enTantalum
dc.subject.enGlass-ceramic
dc.subject.enSpherulite
dc.subject.enSecond harmonic generation
dc.title.enSpherulitic crystallization of quartz-like GeO2 and correlated second harmonic generation in sodium tantalum germanate glasses
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jallcom.2021.160245
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Alloys and Compounds
bordeaux.page160245
bordeaux.volume877
bordeaux.peerReviewedoui
hal.identifierhal-03257265
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03257265v1
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