Atomistic modeling approach to the thermodynamics of sodium silicate glasses

Paul C. M. Fossati, Thomas Mellan, Navaratnarajah Kuganathan, William Lee

Research output: Contribution to journalArticle

Abstract

A good description of the vibration modes of silicate glasses is necessary for the accurate determination of their thermodynamical properties. Whilst the properties of amorphous SiO2 are wellknown,
those of more complex silicate glasses remain poorly described. In this work, the atomicscale models have been used to investigate the vibration modes and thermodynamical properties of amorphous sodium silicate (Na2O)x(SiO2)1−x. Several empirical potentials have been considered, and their predictions have been compared to available experimental data. Different Na2O concentrations
have also been simulated, highlighting the effect of sodium network modifiers on vibration spectra and thermodynamical properties. Statistical effects related to the simulation box size have been investigated, which helps interpreting quantitative results from simulations based on small systems, e.g. electronic structure calculations. The potentials used can describe different oxides besides SiO2 and Na2O. The results presented here pave the way for future use of these potentials to study more complex glasses with different types of network formers and modifiers.

Original languageEnglish
Pages (from-to)(In-press)
Number of pages43
JournalJournal of the American Ceramic Society
Volume(In-press)
DOIs
Publication statusE-pub ahead of print - 30 Oct 2020

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