The addition of alkali oxides to silicate glasses results in the disruption of the silicate network and the formation of non-bridging oxygen atoms and Qn species. Lithium-containing silicate glasses behave differently than other alkali-containing silicate glasses. Addition of Li2O to silicate and germanate glasses generates Q2 species at low Li contents. Furthermore, the preference for Q2 formation is enhanced in Li-germanate relative to Li-silicate glasses. The proposed mechanism for incorporation of the Li involves its bonding to pairs of non-bridging atoms of oxygen on adjacent Q2 tetrahedra, resulting in a Li coordination of 4 in a square-planar configuration.
Leonie G. Soltay and Grant S. Henderson
Department of Geology, University of Toronto, 22 Russell Street, Toronto, Ontario M5S 3B1, Canada
E-mail address: firstname.lastname@example.org
Keywords: glasses, structure, lithium, alkalis, germanates, melts, Q species, silicates.