Low-frequency Raman scattering in binary silicate glass: Boson peak frequency and its general expression

Abstract

Low-frequency Raman measurement was performed in alkali and alkaline-earth silicate glasses to elucidate the effect of introduction of network modifiers on boson peak nature. Our study illustrated that introduction of small/medium ions tended to increase in the boson peak frequency (½ BP ), whereas the introduction of large ions tended to decrease the frequency. Although ½ BP has been suggested to be proportional to the shear modulus, no linear relationship was obtained in these binary systems. Instead, we experimentally demonstrated that mean atomic volume can explain variations in ½ BP regardless of the trend of boson peaks.©2013 The Ceramic Society of Japan. All rights reserved.Key-words : Glass, Raman scattering, Silicate, Boson peak, Optical spectroscopy [Received September 25, 2013; Accepted October 31, 2013] Silicate minerals are widely deposited in the earth's crust, thereby making silicate glass easily available. Historically, silica and silicate-system glasses have been used in lenses, optical fibers, displays of mobile devices, etc. because of their good transparency and thermal/mechanical resistance, contributing greatly to the development of modern science and culture. Nowadays, silica/silicate glasses have been intensively investigated for applications in photonic technology.

Boson peak, heterogeneity and intermediate-range order in binary SiO2-Al2O3 glasses

“…Nakamura et al . also found 79 a linear relationship between the Boson peak frequency ω BP and the mean atomic volume V M /Å 3 representative for the interatomic distance: ω BP decreases when V M /Å 3 increases. In the present data, we confirm this trend.…”

“…79 were interested in the effect of introducing network modifying cations on the nature of the Boson peak, conducting their study on binary alkali and alkaline-earth silicate glasses of the type (100-x) SiO 2 −xM [M = Li 2 O, CaO, Na 2 O, K 2 O, BaO]. They found two trends in which the size of the ions introduced into the network either increases ( r ion / r Si <2.5) or decreases ( r ion / r Si >2.5) the Boson peak.…”

A novel method for stress evaluation in chemically strengthened glass based on micro-Raman spectroscopy

“…In the spectra, we focused on the four peaks, i.e., Boson (~60 cm −1 ), D 1 (~480 cm −1 ), D 2 (~580 cm −1 ), and A 1 (1090-1100 cm −1 ) peaks [22][23][24] . Here the Boson peak arises from acoustic modes in medium-range structure, but the origin remains controversial [25][26][27][28] . The D 1 and D 2 peaks correspond to symmetric stretching of O atoms, namely, breathing mode, in the four-and three-membered rings of TO 4 tetrahedra, respectively, where T = Al or Si 22 .…”

“…(1) using Raman spectroscopy. In the various oxide glasses, it is known that the Boson peak positions k BP (cm −1 ) are related to the mean atomic volume V (×10 −3 nm 3 /atom), although the reason has been controversial, whose relation is approximated by 25 V % 21 À 0:11k BP : ð9Þ Figure 3c shows the values of V evaluated from Eq. (9), where, as anticipated in Fig.…”

Low-Temperature Excess Specific Heat in Oxide Glasses: Comprehensive Study of Thermometrically Observed Boson Peak

“…[13][14][15] Experimentally, the BP is associated with factors such as fragility and elasticity. 4,8,16,17) Nevertheless, which theory or model best describes the BP feature is still under debate, and it is not yet known which physical property is connected to the BP. As a result, the BP has been attracting significant research attention for decades.…”