Cold- and hot-densification of a depolymerized glass: A multiscale vibrational investigation of PbSiO3

Author(s)

Pena, R. B. ; Deschamps, T. ; Le Floch, S. ; Berthelot, A. ; Romeo, E. ; Cunha, T. R. ; Peitl, O. ; Rodrigues, A. D. ; Martinet, C. ; Pizani, P. S.

• Document type: Journal article
• Source: Journal of Non-Crystalline Solids; v. 646, p. 7-pg., 2024-10-05.

Abstract

In this study, we investigated the effect of different compression routes on the lead metasilicate (PbSiO3) composition. Glass samples were compressed in a Belt press up to 5 GPa at room temperature (cold compression) and high temperatures (hot compression) up to 673 K, both at comparable experimental conditions concerning pressure and temperature gradients and times. The set of densified glasses was analyzed ex-situ by Brillouin, Raman and infrared spectroscopies, providing a multiscale structural probe. The dataset revealed a progressive decrease in the refractive index-weighted longitudinal sound velocities for the cold-compression and a minimum at about 450 K for hot-compression. Raman and infrared analyses indicate increasing depolymerization of the silicate network as an effect of densification, which is more pronounced at higher temperatures. Moreover, distinct mechanical properties are discussed regarding the inherent structural modifications resulting from the compression treatments. (AU)

• FAPESP's process: 19/11446-6 - Structural study of pure and cobalt-doped lead metasilicate glasses and glass-ceramics under high-temperature compression
• Grantee: Rafaella Bartz Pena
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• 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)
• FAPESP's process: 19/12383-8 - Study of structural and vibrational properties of glass and glass-ceramic materials via Raman scattering as a function of temperature and high hydrostatic pressures.
• Grantee: Thiago Rodrigues da Cunha
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 21/13974-0 - High-pressure studies in glass silicates
• Grantee: Ariano De Giovanni Rodrigues
• Support Opportunities: Regular Research Grants