Low-frequency band at 50 cm−1 in the Raman spectrum of cristobalite: identification of similar structural motifs in glasses and crystals of similar composition

Сигаев, В. Н.; Smelyanskaya, E. N.; Плотниченко, В. Г.; Колташев, В. В.; Волков, А. А.; Pernice, P.

doi:10.1016/s0022-3093(99)00242-2

Cited by 34 publications

(22 citation statements)

References 19 publications

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“…Spectroscopic similarities between silica glass and cristobalite [26], and same anomalous transition to higher density associated with bulk modulus drop-off [14], support this assumption. Moreover, evolution of bond angle with pressure (Fig.…”

Section: Discussionmentioning

confidence: 73%

Elastic anomalous behavior of silica glass under high-pressure: In-situ Raman study

Deschamps¹,

Martinet²,

Ligny³

et al. 2009

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 73%

Elastic anomalous behavior of silica glass under high-pressure: In-situ Raman study

Deschamps¹,

Martinet²,

Ligny³

et al. 2009

Journal of Non-Crystalline Solids

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“…[3] for glasses with twodimensional (2D) local structure and Ref. [4] for 3D network glasses, or from purely disorder-induced localized vibrational modes e.g. in metallic glasses [5].…”

Section: Introductionmentioning

confidence: 99%

Pressure dependence of the Boson peak in glassy As2S3 studied by Raman scattering

Andrikopoulos

Christofilos

Kourouklis

et al. 2006

Journal of Non-Crystalline Solids

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A detailed pressure dependence study of the low energy excitations of glassy As 2 S 3 is reported over a wide pressure range, up to 10 GPa. The spectral features of Boson peak are analyzed as a function of pressure. Pressure effects on the Boson peak are manifested as an appreciable shift of its frequency to higher values, a suppression of its intensity, as well as a noticeable change of its asymmetry leading to a more symmetric shape at high pressures. The pressure-induced Boson peak frequency shift agrees very well with the predictions of the soft potential model over the whole pressure range studied. As regards the pressure dependence of the Boson peak intensity, the situation is more complicated. It is proposed that in order to reach proper conclusions the corresponding dependence of the Debye density of states must also be considered. Comparing the low energy modes of the crystalline counterpart of As 2 S 3 , as well as the experimental data concerning the pressure dependencies of the Boson peak frequency and intensity, a structural or glass-to-glass transition seems to occur at the pressure $4 GPa related to a change of local dimensionality of the glass structure. Finally, the pressure-induced shape changes of the Boson peak can be traced back to the very details of the excess (over the Debye contribution) vibrational density of states.

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“…Since the term BP is used for any peak in the low frequency inelastic scattering intensity one has to distinguish between different cases. In some materials the BP is ascribed to low lying optical or transverse acoustic modes of parental crystals 8,9,10 or to librations of some molecules in plastic crystals. 11,12 If these excitations have a small frequency spread they will show as a peak in g(ω).…”

Section: Introductionmentioning

confidence: 99%

Pressure dependence of the boson peak in glasses

2005

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The inelastic scattering intensities of glasses and amorphous materials has a maximum at a low frequency, the so called Boson peak. Under applied hydrostatic pressure, P , the Boson peak frequency, ω b , is shifted upwards. We have shown previously that the Boson peak is created as a result of a vibrational instability due to the interaction of harmonic quasi localized vibrations (QLV). Applying pressure one exerts forces on the QLV. These shift the low frequency part of the excess spectrum to higher frequencies. For low pressures we find a shift of the Boson peak linear in P , whereas for high pressures the shift is ∝ P 1/3 . Our analytics is supported by simulation. The results are in agreement with the existing experiments.

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Low-frequency band at 50 cm−1 in the Raman spectrum of cristobalite: identification of similar structural motifs in glasses and crystals of similar composition

Cited by 34 publications

References 19 publications

Elastic anomalous behavior of silica glass under high-pressure: In-situ Raman study

Elastic anomalous behavior of silica glass under high-pressure: In-situ Raman study

Pressure dependence of the Boson peak in glassy As2S3 studied by Raman scattering

Pressure dependence of the boson peak in glasses

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