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In the framework of topological constraint theory, network glasses areclassified as flexible, stressed--rigid, or isostatic if the number of atomicconstraints is smaller, larger, or equal to the number of atomic degrees offreedom. Here, based on molecular dynamics simulations, we show that sodiumaluminosilicate glasses exhibit a flexible-to-stressed--rigid transition drivenby their composition. This transition manifests itself by a loss of atomicmobility and an onset of internal atomic stress. Importantly, we find that theflexible-to-rigid (i.e., loss of internal flexibility) andunstressed-to-stressed transitions (i.e., onset of internal stress) do notoccur at the same composition. This suggests that the isostatic state (i.e.,rigid but unstressed) is achieved within a window rather than at a thresholdcomposition.

Topological Origins of Flexibility and Internal Stress in Sodium Aluminosilicate Glasses