Structure and thermal relaxation of network units and crystallization of lithium silicate based glasses doped with oxides of Al and B

Anuraag Gaddam; Hugo R Fernandes; Bertrand Doumert; Lionel Montagne; José M F Ferreira

doi:10.1039/c7cp01690e

Structure and thermal relaxation of network units and crystallization of lithium silicate based glasses doped with oxides of Al and B

Phys Chem Chem Phys. 2017 Oct 4;19(38):26034-26046. doi: 10.1039/c7cp01690e.

Authors

Anuraag Gaddam¹, Hugo R Fernandes, Bertrand Doumert, Lionel Montagne, José M F Ferreira

Affiliation

¹ Department of Materials and Ceramics Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal. jmf@ua.pt.

PMID: 28920979
DOI: 10.1039/c7cp01690e

Abstract

The current study reports on the relaxation behaviour of lithium silicate based glasses as probed by NMR spectroscopy. A total of four glass compositions were studied with the parent composition being 28Li₂O-72SiO₂, and added dopants of Al and B. All the compositions showed significant differences in the NMR spectra of both annealed and non-annealed glasses demonstrating the structural relaxation behaviour. We extended our binary statistical mechanical model to these complex compositions to study the relaxation behaviour. By the combined use of the extended statistical mechanical model and broken ergodicity, we shed light on the mechanism of structural relaxation as understood by NMR spectroscopy. We studied the crystallization behaviour of the glasses and reported on the variations of the residual glass composition changes in the crystallization fraction.