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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Casati, R. |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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Simon, Guilhem
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- 2025Spectroscopic mapping of biodeterioration products on cementitious materials in sewer networks exposed to low H2S levelscitations
- 2023Influence of the nanocrystallinity on exchange bias in Co/CoO core/shell nanoparticlescitations
- 2012Structural and vibrational characterization of medieval like glass samplescitations
- 2008Nature of the hyper-Raman active vibrations of lithium borate glassescitations
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article
Nature of the hyper-Raman active vibrations of lithium borate glasses
Abstract
Hyper-Raman spectra of two lithium borate glasses, 4B(2)O(3): Li2O and 2B(2)O(3): Li2O, are compared to those of pure boron oxide glass, upsilon-B2O3. A mode analysis is performed using a structural model based on the symmetry of the elementary structural units (ESUs) constituting the glasses. Most spectral components arise from internal vibrations of BO3 triangles, B3O3 boroxol rings, and BO4 tetrahedra. In particular, a mode associated with stretching motions of BO4 units can be assigned to a vibration of F-2 symmetry in the T-d tetrahedral point group. The hyper-Raman scattering intensity of its transverse optic component appears to be proportional to the number of BO4 units in the glass. The boson peak observed in hyper-Raman scattering arises from external modes of rigid ESUs which correspond to librational motions coupled to their translations. The scattering strength of these modes strongly decreases with increasing Li concentration. In pure upsilon-B2O3, external modes of boroxols presumably dominate this scattering. The decrease in the boroxol concentration in lithium borate glasses correlates with the apparent hardening of the boson peak.