Study on crystallization process of SiO2 based SiO2-Li2O nano-wire glass ceramic: A molecular dynamics simulation based on SCC-DFTB calculations

Abstract

The aim of this study was to investigate the crystallization behavior of nano-wire SiO2-Li2O glass ceramic during the slow cooling process by using density functional theory (DFT). For this purpose, the extended tight-binding with self-consistent charge (SCC-DFTB) was used to investigate the geometric optimization and molecular dynamics (MD) process for model system. The structural development was analysed by radial distribution function (RDF) at determined temperatures. The results show that the system tends to crystallization at lower temperatures and transforms from liquid phase to crystal phase with a slow cooling rate.