“…152 Trivalent samarium doped K-Mg-Al zinc uorophosphate glasses are formed by networks of phosphate and modied by K, Mg, Al, Zn and F. The stretching vibration of Al-O linkages in AlO 4 structural units was observed. 153,154 The structure of a 2P 2 O 5 -CaO-0.05ZnO glass matrix contains Raman bands near 345, 460, 903, 959, 1011, 1137, 1168, 1297 and 1400 cm À1 . The content of Ag 2 O in the glass system modied the network of ring structures.…”