Optical and spectroscopic characterisation of permanently densified GeO ₂ glasses

Laura Orsingher (1, 2) , Marco Calicchio (3) , Giovanni Carini (4) , Roberto Dal Maschio (5) , Daniele Fioretto (6) , Aldo Fontana (2, 7) , Patrizia Fumagalli (8) , Edmondo Gilioli (3) , Maurizio Mattarelli (9) , Enrico Moser (7) , F. Rossi (10)

1 Fisica
2 INFM CRS-SOFT, c/o Università di Roma “La Sapienza
3 IMEM-CNR - Istituto dei Materiali per l'Elettronica ed il Magnetismo [Genova]
4 physics
5 Dipartimento di Ingegneria dei Materiali e delle Tecnologie Industriali
6 Fisica
7 physics
8 Dipartimento di Scienze della Terra "Ardito Desio"
9 university of trento, physics
10 Fisica

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.

Mots clés: Physical Sciences

Laura Orsingher, Marco Calicchio, Giovanni Carini, Roberto Dal Maschio, Daniele Fioretto, et al.. Optical and spectroscopic characterisation of permanently densified GeO ₂ glasses. Philosophical Magazine, 2008, 88 (33-35), pp.3907-3914. ⟨10.1080/14786430802247213⟩. ⟨hal-00513917⟩