Structure of lithium silicate glass by isotope substitution
The Li2O-SiO2 system is at the heart of many technologically important glass-ceramic materials. However, little is known about the coordination environment of Li because of its inaccessibility from both x-ray diffraction and NMR experiments. The structure of Li2O-SiO2 glasses will therefore be investigated by using the method of neutron diffraction with Li isotope substitution. The results will reveal how the Li coordination environment changes with composition. They will also reveal the accompanying changes to the silicate network. The results will be combined with those obtained from 29Si NMR and high-energy x-ray diffraction in order to (i) establish how Li affects the composition-dependent connectivity of the silicate network, (ii) build realistic atomistic models of the glass structure in order to establish the origin of the increased rigidity of the glass with increased Li2O content and to elucidate the role played by voids in promoting fast-ion conductivity, and (iii) provide benchmarks for investigating the structural origin of the mixed alkali effect and the zero coefficient of thermal expansion in commercially important glass-ceramics.
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SALMON Philip Stephen; CUELLO Gabriel; Henry E. Fischer; Hesameddin Mohammadi and ZEIDLER Anita. (2021). Structure of lithium silicate glass by isotope substitution. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-05-1051
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