X-Ray Spectroscopy of Ion-Exchanged Glasses

摘要

X-ray absorption spectroscopy makes it possible to identify the local atomic structure around cations in ion-exchanged glasses. EXAFS experiments demonstrate that the substitution of sodium by silver leads to local rearrangements below T_G whereas the incorporation of Rb or Cs does not generate a cation specific environment. Fe K-edge XANES spectra confirm that the oxidation of Fe~(2+) is accompanied by the reduction of silver ions. A structural interpretation of the modified mixed mobile effect as a result of an ion exchange has been developed.