High-pressure plastic deformation of lead metasilicate glass accessed by Raman spectroscopy: Insights into the Q(n) distribution

Author(s)

Pena, R. B. ^{[1, 2, 3]} ; Laurent, V ^[2] ; Deschamps, T. ^[2] ; Romeo, E. ^[2] ; Picinin, A. ^{[1, 3]} ; Martinet, C. ^[2] ; Pizani, P. S. ^{[1, 3]}

Affiliation

^[1] Univ Fed Sao Carlos, Phys Dept, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Lyon, Univ Lyon 1, Inst Lumiere Matiere ILM, CNRS, F-69622 Villeurbanne - France

^[3] Univ Fed Sao Carlos, Ctr Res Technol & Educ Vitreous Mat, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Journal of Non-Crystalline Solids; v. 567, SEP 1 2021.
• Web of Science Citations: 0

Abstract

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 Q(n) distribution. With a high Pb content, this glass exhibits a low elastic limit at similar to 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 Q(n) 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. (AU)

• FAPESP's process: 17/11868-2 - Correlation between structure and optical properties of (Äx, A'1-x)O + SiO2(A,A'= Pb,Ni,Co,Cr) glass ceramic serie under high hydrostatic pressure
• Grantee: Rafaella Bartz Pena
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)