Composition–structure–property relationships in boroaluminosilicate glasses

Elasticity of ion stuffing in chemically strengthened glass

“…In both systems, the network dilation anomaly is the result of differences in the local alkali environments between as-melted and ion-exchanged glasses, where the invading potassium ions in the ion-exchanged glasses are unable to achieve the desired structural environment corresponding to that of as-melted versions of the same glass. Despite the differences in the structural role of alkali ions in silicate versus aluminosilicate glasses [30], this explanation of the network dilation anomaly appears to be universal. When the potassium ions are substituted for sodium during the ion exchange process, the average K-O coordination number takes on an intermediate value between what would be expected for potassium in the initial sodium-containing glass and what is ultimately desired in the pure potassium end member.…”

Topological Model for Boroaluminosilicate Glass Hardness

“…We first consider the series of glasses with varying Si/Al ratio [(80 − x)SiO 2 − x Al 2 O 3 − 5 B 2 O 3 − 15 Na 2 O with x = 0, 1, 2.5, 5, 7.5, 10, 12.5, 15, 17.5, and 20], for which hardness data have already been reported (Zheng et al, 2012b). Figure 1 shows the composition dependence of the experimentally determined hardness values and those calculated based on Eqs 1 and 2 with the analyzed chemical compositions and 11 B and 27 Al magic angle spinning (MAS) NMR data as input (Zheng et al, 2012a).…”

“…Structural data from solid-state nuclear magnetic resonance (NMR) spectroscopy is already available for these glass www.frontiersin.org series (Zheng et al, 2012a;Smedskjaer et al, 2014). In addition, the Vickers microhardness has previously been measured for the first series with varying Si/Al ratio (Zheng et al, 2012b). For the other two series, we have here determined it using the same method.…”

“…Such predictions are particularly difficult for mixed networkformer systems, since their complicated structural speciation (Zielniok et al, 2007;Manara et al, 2009;Zheng et al, 2012a) can lead to non-linear variations in hardness (Zheng et al, 2012b). Boroaluminosilicate glasses constitute an important class of mixed network-former glasses as they have found widespread applications in fields such as consumer electronics (Wondraczek et al, 2011), bioactive materials for regeneration of bone and tissue (Hench, 2006), fiberglass for composite applications , and radioactive waste containment (Jantzen et al, 2010).…”

Grand Challenges in Glass Science

“…Despite their ubiquity, silicate glasses have complex structures (Mysen and Richet, 2005;Zheng et al, 2012) that are still only partially understood. Improvements in our understanding of structure-property relationships as a function of silicate glass chemistry will be of great value in the design and discovery of new industrial glasses .…”