Ferroelectric properties of Sr 2 Bi 4 Ti 5 O 18 thin films prepared by sol-gel method

High quality Sr 2 Bi 4 Ti 5 O 18 (SBTi) ferroelectric thin films on Pt/Ti/SiO 2 /Si(100) substrates were successfully prepared using the sol-gel method.The microstructure, ferroelectric properties and fatigue characteristics of SBTi thin films were investigated.The results show that the films with smooth surface are of single phase of SBTi and randomly oriented. The well-saturated ferroelectric hysteresis loops and the fatigue properties were obtained by hysteresis measurements using a metal-ferroelectric-metal structure. The remnant polarization (2P r ) and coercive field (2E c ) reached to 24.0μC/cm 2 and 137.8kV/cm, respectcively in the electric field of 275kV/cm. No fatigue was observed up to 4.4×10 10 switching cycles.