The book deals with the study of influence of some modifier oxides (viz., PbO, ZnO, BaO, SrO, CaO) on electrical and spectroscopic properties of lithium antimony germanate glasses. Such studies were also extended to lithium antimony lead germanate glass systems doped with some VI B group elements (chromium (Cr),  molybdenum (Mo), tungsten (W)). The investigation deals with the methods of preparation, characterization by XRD and studies on physical properties (density, molar volume, inter ionic separation, polaron radius etc.), dielectric properties (viz., dielectric constant, dielectric loss and a.c. conductivity over a wide range of frequency and temperature and dielectric breakdown strength at room temperature), spectroscopic properties (viz., optical absorption, electron spin resonance, IR, Raman spectroscopy) of above mentioned glass systems.