Field strength effect on structure, hardness, and crack resistance in single modifier aluminoborosilicate glasses. Issue 2 (5th October 2022)

• Record Type: Journal Article
• Authors: Fry, Aubrey L.; George, Christy; Slagle, Ian; Hawbaker, Harry; Feller, Steve; Kim, Seong H.; Mauro, John C.
• Is Part Of: Journal of the American Ceramic Society. Volume 106:Issue 2(2023)
• Page Start: 951
• Page End: 966
• Publication Date: 2022-10-05
• Subjects: aluminoborosilicate -- crack resistance -- field strength -- hardness -- solid‐state NMR; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.18796
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Although the interactions among glass formers and modifiers, for example, connectivity and charge distribution, have been studied extensively in oxide glasses, the impact of a particular modifier species on the mechanical performance of aluminoborosilicate (ABS) glasses is not well understood. This work compares the indentation properties of six ABS glasses, each of which contains a different network modifier (NWM) with varying field strength (FS). Three alkali and three alkaline earth ABS glasses were designed with low NWM content and [NWM] ≈ [Al2 O3 ], to test the modifier FS effect at low concentrations and to maximize three‐coordinated boron. It has been found that both hardness and crack resistance increase with increasing FS in these ABS systems, which is surprising in the context of historical reports. Using 11 B, 27 Al, and 29 Si solid‐state nuclear magnetic resonance, this work provides evidence of how charge distributions differ as a function of NWM species, and how this relates to the observed indentation behaviors.