Pressure‐driven homogenization of lithium disilicate glasses

Author:

Bakhouch Yasser1,Buchner Silvio2ORCID,Silveira Rafael Abel2ORCID,Resende Leonardo2ORCID,Pereira Altair Soria2,Hasnaoui Abdellatif1,Atila Achraf3ORCID

Affiliation:

1. LS2ME Faculté Polydisciplinaire Khouribga Sultan Moulay Slimane University of Beni Mellal Khouribga Morocco

2. Graduate Program in Materials Science Federal University of Rio Grande do Sul Porto Alegre Brazil

3. Department of Material Science and Engineering Saarland University Saarbrücken Germany

Abstract

AbstractLithium disilicate glasses and glass–ceramics are good potential candidates for biomedical applications, solid‐state batteries, and serve as models of nucleation and crystal growth. Moreover, these glasses exhibit a phase separation that influences their nucleation and crystallization behavior. The atomistic mechanisms of the phase separation and their pressure dependence are unclear so far. Here, we used molecular dynamics simulations supported by experiments to assess the spatial heterogeneity of lithium disilicate glasses prepared under pressure. We show that the glass heterogeneity decreases with increasing the pressure under which the system was cooled and almost disappears at pressures around 30 GPa. The origin of the heterogeneity is due to the attraction between Li cations to form clustering channels, which decreases with pressure. Through our results, we hope to provide valuable insights and guidance for making glass–ceramics with controlled crystallization.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Publisher

Wiley

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