Low-frequency Raman scattering of silver borate glasses

被引:5
作者
D'Angelo, G
Vasi, C
Bartolotta, A
Carini, G
Crupi, C
Di Marco, G
Tripodo, G
机构
[1] Univ Messina, Dipartimento Fis, I-98166 Messina, Italy
[2] Univ Messina, Ist Nazl Fis Mat, I-98166 Messina, Italy
[3] CNR, Ist Proc Chim Fis, I-98123 Messina, Italy
来源
PHILOSOPHICAL MAGAZINE | 2004年 / 84卷 / 13-16期
关键词
D O I
10.1080/14786430310001644413
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:1631 / 1638
页数:8
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