Optical and spectroscopic characterisation of permanently densified GeO 2 glasses
Résumé
Optical and spectroscopic characterization was carried out on densified vitreous germania glasses retrieved from pressures in the range 2-6 GPa. The density of the obtained glasses increases with the applied pressure. Ultrasonic and Brillouin measurements show an increase of the longitudinal and shear sound velocity, in agreement with the hardening of the elastic medium. Raman measurements allow us to study the structural modification of the system as a function of its density and to follow the evolution of the Boson Peak, which shifts towards higher frequencies and decreases in intensity.
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