Low-frequency Raman scattering of silver borate glasses
Authors: G. D'Angelo1; C. Vasi2; A. Bartolotta2; G. Carini1; C. Crupi1; G. Di Marco2; G. Tripodo1
Source: Philosophical Magazine, Volume 84, Numbers 13-16, 1 May-1 June 2004 , pp. 1631-1638(8)
Publisher: Taylor and Francis Ltd
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Abstract:
The vibrational dynamics of Ag2O-B2O3 glasses has been investigated by Raman spectroscopy in the frequency region below 200 cm-1. The spectra show the presence of the boson peak (BP), whose shape and frequency location are almost independent of the silver concentration. The increase in the sound velocity with increasing Ag+ content testifies to the progressive stiffening of the borate skeleton and refers to the existence of acoustic modes with increasing frequency. Consequently it is believed that the vibrational modes mainly contributing to the BP have a localized character and are decoupled from the acoustic phonons. An interpretation of these experimental observations ascribes a significant role in the evolution of the low-frequency vibrational dynamics of these glasses to the local vibrations of Ag+ ions.Document Type: Research article
DOI: 10.1080/14786430310001644413
Affiliations: 1: Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia Università di Messina Santa Sperone 31 I-98166 Messina Italy 2: Istituto per i Processi Chimico-Fisici Consiglio Nazionale delle Ricerche Via la Farina 237 I-98123 Messina Italy
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