Temperature effects on the structure of lead metasilicate glass, supercooled liquid, crystal, and liquid: Vibrational anharmonicity and configurational transformations analyzed by molecular dynamics and Raman scattering

• Published in: Journal of non-crystalline solids Vol. 636; p. 122992
• Main Authors: Pizani, P.S., Cunha, T.R., Pena, R.B., Picinin, A., Rodrigues, A.D., Rino, J.P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.07.2024
• Subjects: Molecular Dynamics; Raman spectroscopy; Vibrational Anharmonicity, Lead Metasilicate, Temperature Effects on the Structure; Raman spectroscopy; Vibrational Anharmonicity, Lead Metasilicate, Temperature Effects on the Structure; Molecular Dynamics
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2024.122992

•Is the silicate glass structure, described by the Qn population, sensitive to temperature?•Raman Spectroscopy and Molecular Dynamic Simulations respond: No•In glass and crystalline phases only vibrational anharmonicity is observed.•In supercooled and liquid phases the response is:Yes Raman spectroscopy and Molecular Dynamics (MD) simulations were employed to explore in detail the effects of temperature on the four stages of the PbO∙SiO2 system: glass, supercooled liquid, crystalline phases, and liquid. The Qn distribution up to 1153 K and the wavenumber temperature coefficients derived from vibrational anharmonicity were determined from the Raman data, whereas the structural transformation reflected in changes in the Qn population distribution up to 2400 K was inferred from MD simulations. The results indicate that reversible configurational transformations occur only in the higher temperature ranges of the supercooled liquid and more notably in the liquid state. During these transformations, the increase in the Q0 and Q1 populations occurs at the expense of the Q3 and Q4 populations. On the other hand, only vibrational anharmonicity was observed in the glass and crystalline states.