High-Pressure Plastic Deformation of Lead Metasilicate Glass Accessed by Raman Spectroscopy: Insights into the Q n distribution

R. B. Pena (1, 2) , V Laurent (1) , T Deschamps (1) , E Romeo (1) , A. Picinin (2, 1) , Christine Martinet (1) , P Pizani (2)

1 iLM - SOPRANO - iLM - Spectroscopies optiques des matériaux verres, amorphes et à nanoparticules
2 UFSCar - Universidade Federal de São Carlos [São Carlos]

In this study, lead metasilicate glasses (PbSiO3) were densified at different maximum pressures in a diamond anvil cell (DAC) at room temperature. The densified glass samples were investigated ex-situ by Raman spectroscopy to probe their pressure-induced plastic deformation limit and permanent structural modifications on the Qn distribution. With a high Pb content, this glass exhibits a low elastic limit at ~4 GPa, which is linked to an initial compact structure. Spectral curve fitting of the high-frequency region of the Raman spectra, consisting of symmetric Si-O stretching modes, exhibit subtle Qn population modifications with maximum pressure. This reveals silica network depolymerization where the proportion of non-bridging oxygens (NBO) increases at the expense of bridging oxygens (BO). Possible densification mechanisms are discussed in contrast to those known in other silicate glasses

Mots clés: Lead Metasilicate Glass; High-Pressure; Structure; Densification; Raman Spectroscopy; Medium-Range Order

Domaines: Mécanique des solides [physics.class-ph]

R. B. Pena, V Laurent, T Deschamps, E Romeo, A. Picinin, et al.. High-Pressure Plastic Deformation of Lead Metasilicate Glass Accessed by Raman Spectroscopy: Insights into the Q n distribution. Journal of Non-Crystalline Solids, 2021, 567, pp.120930. ⟨10.1016/j.jnoncrysol.2021.120930⟩. ⟨hal-03602117⟩