A Raman scattering study of permanently densified vitreous B2O3

Carini jr., G. (2011) A Raman scattering study of permanently densified vitreous B2O3. Il nuovo cimento C, 34 (5). pp. 95-102. ISSN 1826-9885

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Inelastic light scattering spectra of normal and permanently densified B2O3 glasses were investigated over the frequency range between 6 and 1600 cm−1. Densification from 1825 kg/m3 up to 2082 kg/m3 was obtained by loading B2O3 glasses in a multi-anvil apparatus for the synthesis at 2GPa; they were fused at 1500K and then quenched at that pressure. The low-frequency Raman scattering includes the Boson peak, which dominates the spectra between 10 and 100 cm−1. Densification significantly decreases the intensity of the Boson peak and shifts its position from about 26 cm−1 up to 39 cm−1. At higher frequencies, the spectral features of the bands associated to the vibrational motion of boroxol rings and BO3 units building up the network indicate that these molecular groups keep the main characteristics of their conformation, even if the connectivity of these groups is varied as a consequence of a decrease of the ring concentration. These observations imply that densification drives the system toward a structure having a more efficient packing of molecular units.

Item Type: Article
Uncontrolled Keywords: Disordered solids ; Glasses and amorphous solids
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 08 Apr 2020 16:37
Last Modified: 08 Apr 2020 16:37
URI: http://eprints.bice.rm.cnr.it/id/eprint/17456

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