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

Autor(es)

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]}

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Non-Crystalline Solids; v. 567, SEP 1 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 17/11868-2 - Correlação entre estrutura e propriedades ópticas de materiais vitrocerâmicos da série (Ax,A'1-x)O + SiO2 (A,A'= Pb,Ni,Co,Cr) submetidos a altas pressões hidrostáticas
• Beneficiário: Rafaella Bartz Pena
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto