Raman and far IR studies on Ag2CdI4 and Cu2CdI4 superionic compounds

Raman spectral studies, far infrared reflection and transmission spectra for the superionic conductors Ag₂CdI₄, Cu₂CdI₄ at 300 K are reported. From these studies the TO and LO modes are assigned and optical conductivity in the region 30 cm^-1-150 cm^-1 are calculated. The behaviour of conductivity in this frequency region is explained on the basis of jump diffusion model.