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Leaching of Glasses with Molar Composition 20Na 2 O · 10RO · x Al 2 O 3 · (70‐x)SiO 2
Author(s) -
SMETS BRUNO M. J.,
THOLEN MARGRIET G. W.
Publication year - 1984
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1984.tb18848.x
Subject(s) - leaching (pedology) , corrosion , chemical composition , sodium , ion , mass fraction , materials science , divalent , secondary ion mass spectrometry , chemistry , mineralogy , inorganic chemistry , metallurgy , composite material , geology , soil water , organic chemistry , soil science
Sodium depth profiles were determined in water‐leached glass samples with molar composition 20Na 2 O · 10RO · x Al 2 O 3 · (70 ‐ x)SiO 2 (RO = CaO, MgO, and ZnO) using secondary ion mass spectrometry. The leaching of sodium ions decreases with increasing Al 2 O 3 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.