Raman scattering in AgI-Ag2O-P2O5 glasses

Superionic glasses with 0.5AgI .(0.5-x)Ag2O . xP(2)O(5) composition for x i n the range 0.14-0.25 have been prepared by the splat quenching method. Ram an spectra were measured for all compositions. Observed spectral features w ere interpreted in terms of different modes of vibration of the phosphate n etwork. Mode frequencies were determined by deconvolution of the obtained s pectra. They have been assigned to different types of PO4 groupings. In the composition range considered ortho-, pyro- as well as metaphosphate groupi ngs have been identified. Change of relative intensities of the relevant sp ectral peaks as a function of the composition has been observed.