Abstract
The X‐ray absorption fine structure (XAFS) technique was used to analyze the structural geometry of Ag atoms introduced into soda‐lime silicate glass and soda aluminosilicate glass by ion‐exchange methods. The results show that Ag+ ions in aluminosilicate glass are coordinated by about two oxygens and the nearest‐neighbor Ag‐O distance increases when the Ag+‐for‐Na+ ion‐exchange ratio is larger than 0.47. When the exchange ratio is low, the introduced Ag+ ions are stabilized at the non‐bridge oxygen (NBO) site with a Ag‐O distance of 2.20 A, and the Na+ ions in the AlO4 site are exchanged by Ag+ ions after full replacement of the NBO sites with a Ag‐O distance of 2.28 A. The disorder of Ag‐O coordination increases with increasing ion‐exchange ratio in aluminosilicate glass where Ag+ ions are coordinated by NBO and bridge oxygen (BO).
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