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Effect of Na/Al ratio on the structure and fe redox behavior of Fe2O3-doped sodium aluminosilicate glasses
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DOI：10.1016/j.jnoncrysol.2026.124075.png)
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Abstract
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This study examined how the Na/Al ratio affects the relationship between glass structure and Fe redox behavior and identified the optimal composition that maximizes the efficiency of chemical strengthening. Increasing the Na/Al ratio was qualitatively consistent with reduced silicate-network polymerization while reinforcing charge-compensated tetrahedral species (dominant [AlO4]-with reduced [AlO5] and [BO3]-to-[BO4]-conversion), thereby enhancing ion-exchange strengthening and shifting the Fe redox behavior. Consequently, the Na-rich glasses exhibited a more pronounced Fe2+-related optical contribution near 1035 nm together with a red-shifted absorption edge, which is qualitatively consistent with a composition-dependent tendency toward Fe-related optical changes under similar conditions. Notably, K+<-> Na+ ion exchange produced a higher surface compressive stress and depth of layer with increasing Na content and temperature, and Na-rich compositions exhibited a larger hardness increment despite a lower pristine hardness. Strengthening and impact-related metrics reached a maximum at approximate to 425 degrees C and decreased at 450 degrees C, revealing a competition between stress buildup and relaxation. The density increased up to Na/Al = 1 and decreased at higher Na2O concentrations, whereas the packing density increased and the molar and free volumes decreased, suggesting an increase in geometric packing efficiency associated with volume contraction. This study provides composition-dependent guidelines for designing Fe-containing aluminosilicate glasses with high strengthening responses, large hardness increments, and tunable Fe2+/Fe3+ states.
Keywords:
Aluminosilicate glass
Fe redox behavior
Glass structure
Chemical strengthening
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3.5
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3.3W
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