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

2013 ◽  
Vol 121 (1420) ◽  
pp. 1012-1014 ◽  
Author(s):  
Kensaku NAKAMURA ◽  
Yoshihiro TAKAHASHI ◽  
Minoru OSADA ◽  
Takumi FUJIWARA
Keyword(s):  
Raman Scattering ◽  
Silicate Glass ◽  
General Expression ◽  
Low Frequency ◽  
Peak Frequency ◽  
Boson Peak ◽  
Binary Silicate

The origin of the anomalous low-frequency vibrational behaviour of amorphous solids

1992 ◽  
Vol 02 ◽  
pp. C2-279-C2-283
Author(s):  
S. R. ELLIOTT
Keyword(s):  
Low Frequency ◽  
Peak Frequency ◽  
Amorphous Solids ◽  
Boson Peak ◽  
Low Frequencies ◽  
Crystalline Materials ◽  
Medium Range ◽  
Phonon Localization ◽  
Strong Scattering ◽  
Vibrational Density

The anomalous vibrational behaviour exhibited by non-crystalline materials - a peak in the vibrational density of states, and in the Raman spectrum (the boson peak) at low frequencies, and a peak in the heat capacity and a plateau in the thermal conductivity at low temperatures - is ascribed ta phonon localization associated with the strong scattering of phonons by density-fluctuation domains in the structure. Within such domains, short-range and medium-range arder is maintained, and outside them the material is structurally homogeneous and isotropie. This model can also explain the correlation between the boson-peak frequency and the position of the first sharp diffraction peak in the structure factor observed in a number of inorganie and polymerie amorphous solids.

Kovacs effect in PMMA observed by low-frequency Raman scattering (boson peak)

2006 ◽  
Vol 352 (42-49) ◽  
pp. 4562-4567 ◽  
Author(s):  
A. Wypych ◽  
E. Duval ◽  
A. Mermet ◽  
G. Boiteux ◽  
L. David ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Low Frequency ◽  
Boson Peak

scholarly journals Boson peak, elasticity, and glass transition temperature in polymer glasses: Effects of the rigidity of chain bending

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Naoya Tomoshige ◽  
Hideyuki Mizuno ◽  
Tatsuya Mori ◽  
Kang Kim ◽  
Nobuyuki Matubayasi
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Low Frequency ◽  
Peak Frequency ◽  
Boson Peak ◽  
Polymer Chains ◽  
Coarse Grained ◽  
Elastic Response ◽  
Bending Rigidity

AbstractThe excess low-frequency vibrational spectrum, called boson peak, and non-affine elastic response are the most important particularities of glasses. Herein, the vibrational and mechanical properties of polymeric glasses are examined by using coarse-grained molecular dynamics simulations, with particular attention to the effects of the bending rigidity of the polymer chains. As the rigidity increases, the system undergoes a glass transition at a higher temperature (under a constant pressure), which decreases the density of the glass phase. The elastic moduli, which are controlled by the decrease of the density and the increase of the rigidity, show a non-monotonic dependence on the rigidity of the polymer chain that arises from the non-affine component. Moreover, a clear boson peak is observed in the vibrational density of states, which depends on the macroscopic shear modulus G. In particular, the boson peak frequency ωBP is proportional to $$\sqrt{G}$$G. These results provide a positive correlation between the boson peak, shear elasticity, and the glass transition temperature.

LOW-FREQUENCY RAMAN SCATTERING IN A NUCLEATED CORDIERITE GLASS

1985 ◽  
Vol 46 (C8) ◽  
pp. C8-443-C8-447 ◽  
Author(s):  
A. Boukenter ◽  
B. Champagnon ◽  
E. Duval ◽  
A. F. Wright
Keyword(s):  
Raman Scattering ◽  
Low Frequency ◽  
Cordierite Glass

scholarly journals Low-Frequency (Gigahertz to Terahertz) Depolarized Raman Scattering Off n-Alkanes, Cycloalkanes, and Six-Membered Rings: A Physical Interpretation

2020 ◽  
Vol 124 (35) ◽  
pp. 7611-7624
Author(s):  
Andrew J. Farrell ◽  
Mario González-Jiménez ◽  
Gopakumar Ramakrishnan ◽  
Klaas Wynne
Keyword(s):  
Raman Scattering ◽  
Physical Interpretation ◽  
Low Frequency
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