Excellent piezoelectric property and thermal stability of Pb(Sc, Nb)O3-Pb(Hf, Ti)O3 ceramic

xPb(Sc 1/2 Nb 1/2 )O 3 -(1-x)Pb(Hf 1-y Ti y )O 3 piezoelectric ceramics were prepared by solid state route, and the phase structures and piezoelectric properties of ceramics were systematically investigated. Results showed that the sample with the composition of x=0.07 and y=0.53 possessed higher phase coexistence between the rhombohedral and tetragonal, and exhibited the optimal properties among different constituent systems, i.e. T C =355 °C, d 33 =400 pC/N, ε r =1390 and tan δ =1.05%. Furthermore, the effects of temperature on d 33 , leakage current density, P - E loop, and unipolar strain were studied for xPb(Sc 1/2 Nb 1/2 )O 3 -(1-x)Pb(Hf 0.47 Ti 0.53 )O 3 samples. The sample with x=0.07 revealed better temperature stability as well, the reason of which was analyzed in detail. The study indicates that the 0.07Pb(Sc 1/2 Nb 1/2 )O 3 -0.93Pb(Hf 0.47 Ti 0.53 )O 3 piezoelectric ceramic has excellently comprehensive properties suitable for application in higher temperature condition.