Boson peaks of lithium borate glasses studied by inelastic neutron and light scattering

Low-frequency vibrational properties of crystalline and glassy indomethacin probed by terahertz time-domain spectroscopy and low-frequency Raman scattering

“…A strong correlation is known between the m BP-Raman with the shear modulus [10]. A numerical simulation study [33] predicted that the origin of the boson peak is the Ioffe-Regal limit for a transverse acoustic mode, and its frequency is proportional to the shear modulus l. On the other hand, a study of the glassy IMC by the inelastic X-ray scattering [37] reported that the Ioffe-Regal limit for the longitudinal acoustic mode is about 0.6 THz.…”

“…One common feature in the dynamics of glass-forming materials appears in the gigahertz and terahertz frequency range. The inelastic scattering spectra of glasses have generally shown a universal low-frequency response called the ''boson peak'' in the region below 3.0 THz [10,11]. In specific heat measurements, the excess contribution, which represents the boson peak, was found at low temperatures [12].…”

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

“…7) In addition, the following relationship has been found on the basis of experimental observation: ½ BP £ G. 29) In Fig. 3, we show the relationship between ½ BP and G in the studied glasses.…”

Low-frequency Raman scattering under high pressure in diamond anvil cell: Experimental protocol and application to GeO2 and SiO2 boson peaks

“…A universal feature of amorphous materials like oxide glasses [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], chalcogenide glasses [18], polymers [19,20] or a-Si [21,22] is the presence of vibrational modes in the terahertz region. In glassy materials, these modes are responsible for anomalous thermodynamic properties, like a bump of Cp/T 3 at low temperature, and are thus considered as an excess of Vibrational Density Of States (VDOS) compared to the Debye-VDOS [23].…”