The values for the minimum direct energy gap were determined from references [1],[6]. The lattice constants were determined using the following quadratic expression where x represents the percent of Germanium in the composition: a(x) = 0.002733x2 + 0.01992x + 0.5431 (nm)[9]. C. The Basic Properties of SiO2 and Si3N4 Insulator: SiO2 Si3N4 Structure