An EXAFS study of AgPO3 and AgBaP3O9

The local structure around silver atoms in the crystalline and glassy forms of AgBaP3O9 and AgPO3 has been investigated using Extended X-ray Absorption Fine Structure Spectroscopy (EXAFS). The results are reported at the silver K-edge. The structure of AgBaP3O9 is representative of isolated silver whereas silver pairs have been evidenced in crystalline AgPO3. The present investigation allows to detect the formation of Ag+-Ag+ pairs in both glasses. These data are consistent with crystal chemistry of silver phosphates and the luminescent properties of these materials.