Detection Of Temperature Dependent Structural Rearrangements Of Ion Exchanged Glasses By Exafs Spectroscopy

The macroscopic behaviour of sodium silicate glasses modified by a silver-sodium ion exchange depends on both the configuration of silver in the glasss matrix, that means the incorporation in the glass as ion, neutral atom or metal precipitation, and the lodal environment of each silver atom or ion. First experiments investigating the short range order around silver by EXAFS (Extended X-ray Abosoption Fine Structure) spectroscopy indicate the occurence of structural rearrangments within the local environment of silver in silicate and aluminosilicate glasses although the process temperature was well below the glass tranformation range.