It has been widely investigated that the ferroelectric properties of BaSrTiO3 (BST) perovskites can be modified to exhibit relaxor behavior by Zr substitutions on Ti sites. Therefore, the relationship between the phase transition behaviors with Zr contents has been of great interest. Further the inclusion of Nb in BSZT lattice shows structural and corresponding phase changes. In this work, BSZT samples were prepared using sol gel technique and the effect of Nb doping in BSZT has been studied. Small amount of Nb changes structural, electrical and dielectric properties of BSZT. The inclusion of Nb in lattice has been verified by XRD and the influence of the dopant as well as associated effects on the physical and electrical characteristics are investigated and will be presented.