An EXAFS study of AgPO3 and AgBaP3O9

On the femtosecond laser-induced photochemistry in silver-containing oxide glasses: mechanisms, related optical and physico-chemical properties, and technological applications

“…Similar phenomena were observed in the system Ga 2 O 3 -Na 2 O-P 2 O 5 [49]. Such formation of silver ion pairs, with absorption in the near-UV range, was also reported in different compounds such as halide and phosphate crystals or glass [45,50].…”

“…Its intensity increases with the silver content. Similar results were obtained in silver-exchanged silicate glasses [44] and in crystalline and vitreous AgBaP 3 O 9 polyphosphates [45,46]. In SrB 4 O 7 borates [47], the luminescence of the site emitting at 290 nm was attributed to a crystallographic site of lower symmetry than the one observed in alkali halides.…”

Atomic-Scale Structural Characterization of Silver-Doped Phosphate-Based Glasses Prepared by Coacervation

“…The change in the edge step peak position from vacuum-dried to calcined glasses, which is noticeable for the high silver content glasses, is consistent with a structural change upon calcination. Comparison with Ag K-edge XANES spectra in the literature suggests that this change can be associated with a shift from a more “nitrate-like” environment in the uncalcined glasses to a more “phosphate-like” environment upon calcination. , …”

“…Comparison with Ag K-edge XANES spectra in the literature suggests that this change can be associated with a shift from a more "nitrate-like" environment in the uncalcined glasses to a more "phosphate-like" environment upon calcination. 61,62 The coordination number of the higher silver content glasses appears to drop to 4 upon calcination; however, it is likely that a distorted Ag environment, similar to those seen in Ag 3 PO 4 and AgBaP 3 O 9 , is present in the calcined glasses, with coordination numbers of 5 or 6. However, due to their very distorted nature, fittings of these environments often only capture the shortest, most defined atomic distances, as the longer bonds give evanescent oscillations with large Debye− Waller factors.…”

“…However, due to their very distorted nature, fittings of these environments often only capture the shortest, most defined atomic distances, as the longer bonds give evanescent oscillations with large Debye− Waller factors. 62 An increase in coordination number would normally increase the bond length, 63 but with the inability to represent these longer bonds sufficiently, only the bond lengths associated with the shortest Ag−O bonds are observed.…”