Structure and properties of gallium-rich sodium germano-gallate glasses
SKOPAK, Téa
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre d'Optique, Photonique et Laser [COPL]
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre d'Optique, Photonique et Laser [COPL]
SKOPAK, Téa
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre d'Optique, Photonique et Laser [COPL]
< Réduire
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre d'Optique, Photonique et Laser [COPL]
Langue
en
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 ...Lire la suite >
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
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