Spherulitic crystallization of quartz-like GeO2 and correlated second harmonic generation in sodium tantalum germanate glasses
| Autor: | Frédéric Adamietz, Marc Dussauze, Sonia Buffière, Lia Mara Marcondes, Fabia Castro Cassanjes, Nithavong Cam, Vincent Rodriguez, Gael Poirier, Gislene Batista, Thierry Cardinal, Renato Oliveira Evangelista, Evelyne Fargin |
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| Přispěvatelé: | Instituto de Ciência e Tecnologia, Universidade Federal de Alfenas, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Plateforme Aquitaine de Caractérisation des Matériaux (PLACAMAT), Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires (ISM), Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), The authors would like to thank Brazilian funding agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq, Fundação de Amparo à Pesquisa do estado de Minas Gerais – FAPEMIG, Financiadora de Estudos e Projetos – FINEP, Coordenação de Aperfeiçoamento do Pessoal de Nível Superior – CAPES, for financial support. This research was also supported by the IdEx Bordeaux and the Région Nouvelle Aquitaine. This project has received funding from the European Union’s Horizon 2020 research program under the Marie Skłodowska-Curie Grant agreement No. 823941 (FUNGLASS)., ANR-10-IDEX-0003,IDEX BORDEAUX,Initiative d'excellence de l'Université de Bordeaux(2010) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Spherulite Analytical chemistry Tantalum chemistry.chemical_element Germanium 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention symbols.namesake Differential scanning calorimetry law Materials Chemistry Germanate Crystallization Perovskite (structure) α-GeO2 Auger electron spectroscopy Mechanical Engineering Metals and Alloys Glass-ceramic Second harmonic generation [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Mechanics of Materials symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Alloys and Compounds Journal of Alloys and Compounds, Elsevier, 2021, 877, pp.160245. ⟨10.1016/j.jallcom.2021.160245⟩ |
| ISSN: | 0925-8388 |
| Popis: | International audience; Complex 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. |
| Databáze: | OpenAIRE |
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