“…In view of its simplicity, it appears to be reasonably successful in explaining the basic features of materials. The versatility of this model is further witnessed from its successful applications to explain the semiconducting behaviour [33], nonlinear properties as variation of temperature [1,3,21,34] acoustical parameters of solids [5,19,32,33,35], etc. The theoretical predictions generally show good agreement with measured data for almost all of them.…”