Abstract
Sodium depth profiles were determined in water‐leached glass samples with molar composition 20Na2O · 10RO ·x Al2O3· (70 ‐ x)SiO2 (RO = CaO, MgO, and ZnO) using secondary ion mass spectrometry. The leaching of sodium ions decreases with increasing Al2O3 content in all three glass systems. For x= 0 the leaching is hardly affected by the nature of the divalent cation. For x= 5 and 10 the corrosion resistance is highest for the glass containing ZnO, and for the glasses containing ZnO and MgO, respectively. These glasses correspond to those with the smallest fraction of NBOs. From all these results it is concluded that the nonbridging oxygen atoms play an important role in promoting the leaching of a glass.
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