The phase transition behavior of the ferroelectric Pb(Zr 0.90 Ti 0.10)ZrO3 (PZT 10) and antiferroelectric (PB0.95 BA0.05)ZrO3 ( PBZ05) has been studied using phenomenological theories. This study is focused to observe the effect of B-site doping in PZT and A-site doping in PBZ of ABO3 Perovskite structure