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Lead-based piezoelectric materials such as Pb(Zr,Ti)O3 have been widely used in various types of ensors,actuators,buzzers,medical ultrasonic transducers and other electronic devices because of their excellent piezoelectric properties and good temperature stability.However,these lead-based ceramics will face global restrictions in the near future due to the Pb toxicity.It is urgent to develop lead-free alternative materials with comparable piezoelectric and electromechanical properties to their lead-based counterparts.Recently,xBaTiO3-BiFeO3 based ceramics have been attracted widely attention because of high Curie temperature(TC=574℃)at x=0.25.