Effects of permanent densification on the vibrational density of states of vitreous silica

Zanatta, M.; Fontana, A.; Rossi, F.; Gilioli, E.

doi:10.1016/j.jnoncrysol.2010.11.110

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…As it has been observed in references, [38,61] a drop in the scaling procedure implies a drastic change in the modes rising the BP. This could be the result of a structural modification of the sample.…”

Section: Low-wavenumber Raman Spectrumsupporting

confidence: 56%

“…It is remarkable that if we choose

ω_{S}

to get the same peak intensity, we obtain a slightly different behavior in the low‐

ω

region below ~20 cm −1 . As already mentioned in reference [ 38 ] for the case of permanently densified SiO 2 : (i) Equation does not consider the QES contribution; and (ii) the assumption of

C ((), ω) ~ ω

does not hold for

ω

≪

ω_{BP}

where the coupling function shows a constant trend. [ 57 ] Coherently to Equation , the processed spectra of samples with K# between 0.3 and 0.7, having a similar NBO/T value, perfectly collapse in the same master curve, all along with the low‐wavenumber domain.…”

Section: Resultsmentioning

confidence: 99%

“…As the K 2 O replaces the Na 2 O, calorimetric data show an increase of the glass transition temperature whereas Raman spectra show a marginal structural rearrangement in terms of the Q n species and a significant backward shift of the BP while its intensity increases. Finally, by applying the scaling law for the BP [ 38,39 ] of the investigated glasses, we show that the Na 2 O–K 2 O replacement in the explored M a range (appearing with further minor variations of other major elements) does not cause a strong reorganization of the structure but only a continuous modification of the vibrational properties in the BP range. This is verified only in a limited alkali ratio discussed below, regardless of the small oscillations of the polymerization degree given by the ratio between the nonbridging oxygens (NBO) and T. Finally, the outcomes of these observations suggest that the analysis of the low‐

ω

Raman region provides an alternative and complementary route in analyzing the glassy structure of multicomponent systems.…”

Section: Introductionmentioning

confidence: 94%

See 2 more Smart Citations

New insights about the role of Na–K ratio on the vibrational dynamics of synthetic‐basalt glasses

Cassetta

Zanatta

Biesuz

et al. 2022

J Raman Spectroscopy

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Basalts are among the most abundant igneous rocks on Earth. Originated from the rapid cooling of magma erupted by volcanoes, they are increasingly used as raw materials in glass and ceramic technology due to their unique physicochemical properties. The characteristics of basalts, like the glass transition temperature, are strongly controlled by their structure, which is a function of composition. Therefore, the investigation of the interplay between the intimate structure and the mechanical and physical properties of basalt glasses is of paramount importance in view of their industrial exploitation. Here, we present a Raman study of a set of synthetic-basalt glasses in which the occurrence of small chemical variations appreciably affects their glass transition temperature. We analyzed the Raman spectra focusing on both the spectral regions of the so-called nonbridging oxygens and of the boson peak. We show the existence of a scaling law for the boson peak of four synthetic-basalt glasses, and we infer from its breakdown the occurrence of a deep reorganization of the glass structure resulting from the Na-K replacement in the network, despite small variations of the other major elements.

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Section: Low-wavenumber Raman Spectrumsupporting

confidence: 56%

“…It is remarkable that if we choose

ω_{S}

to get the same peak intensity, we obtain a slightly different behavior in the low‐

ω

region below ~20 cm −1 . As already mentioned in reference [ 38 ] for the case of permanently densified SiO 2 : (i) Equation does not consider the QES contribution; and (ii) the assumption of