SKOPAK, Téa; KROEKER, Scott; LEVIN, Kirill; DUSSAUZE, Marc; MÉREAU, Raphaël; LEDEMI, Yannick; CARDINAL, Thierry; FARGIN, Evelyne; MESSADDEQ, Younès

doi:10.1021/acs.jpcc.8b08632

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SKOPAK, Téa
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre d'Optique, Photonique et Laser [COPL]

KROEKER, Scott
Department of Chemistry

LEVIN, Kirill
Department of Chemistry

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Article de revue

Ce document a été publié dans

Journal of Physical Chemistry C. 2019, vol. 123, n° 2, p. 1370-1378

American Chemical Society

Résumé en anglais

Glass compositions in the gallium-rich region of the ternary GaO3/2–GeO2–NaO1/2 vitreous system are studied as a function of the Na/Ga cationic ratio (ranging from 1.30 to 1.61) for a fixed GeO2 content. Glass structures are investigated by 71Ga magic angle spinning nuclear magnetic resonance, infrared, and Raman spectroscopies, and the thermal, optical, and physical properties are characterized. Vibrational spectra are interpreted with the help of density functional theory calculations. Gallium oxide generally enters the germania network in fourfold coordination, however, for a Na/Ga ratio below unity, gallium cations tend to charge balance with the formation of five- or six-fold coordination units. When the amount of sodium is greater than gallium, nonbridging oxygens are formed preferably on germanate tetrahedral units. These structural descriptions are used to understand the evolution of glass properties such as glass transition temperature, density, and refractive index.< Réduire

Mots clés en anglais

71Ga NMR spectroscopy

vibrational spectroscopy

infrared

germano-gallate glasses

71 Ga NMR spectroscopy

glass structure

DOI

http://dx.doi.org/10.1021/acs.jpcc.8b08632

Project ANR

Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
ImPRession laser de fibres exOtiques Multi-MaTEriaux - ANR-17-CE08-0042

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026