Mixed modifier effects on structural, mechanical, chemical, and mechanochemical properties of sodium calcium aluminosilicate glass

HS Liu and AL Ogrinc and YA Lin and C Wilkinson and K Doss and AL Fry and CH Qu and HT He and TM Gross and NJ Smith and JC Mauro and SH Kim, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 106, 6541-6554 (2023).

DOI: 10.1111/jace.19319

Glass properties are governed by the interplay between network formers and network modifiers; for a given composition of network formers, the ratio of different cationic modifiers compensating the anionic species in the network has a profound effect, which is often nonlinear, called a mixed modifier effect (MME). We have investigated the MME of sodium (Na) and calcium (Ca) in an aluminosilicate (NCAS) glass series following the formula Na2O(30-)(x) CaO(x) Al2O3(10) SiO2(60), where x = 0, 7.5, 15, 22.5, and 30. A nonadditive trend was observed in hardness and indentation toughness, with aqueous corrosion resistance exhibiting a shift from incongruent to congruent corrosion, whereas the network structure determined by molecular dynamics simulations revealed no significant trend with composition. Additionally, the NCAS glass containing both Na2O and CaO within an intermediate range exhibited superior resistance to wear at high humidity, a clear MME phenomenon previously only observed in soda-lime silica.

Return to Publications page