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

• Published in: Physical chemistry chemical physics : PCCP Vol. 19; no. 38; pp. 26034 - 26046
• Main Authors: Gaddam, Anuraag, Fernandes, Hugo R, Doumert, Bertrand, Montagne, Lionel, Ferreira, José M F
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 2017
• Subjects: Chemical Sciences; Material chemistry
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c7cp01690e

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 28Li O-72SiO , 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.