High rhombohedral to tetragonal phase transition temperature and electromechanical response in Pb(Yb1/2Nb1/2)O3-Pb(Sc1/2Nb1/2)O3-PbTiO3 ferroelectric system near the morphotropic phase boundary

Relaxor-PT crystals, that is, Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PMN-PT) and Pb(In1/2Nb1/2)O-3-Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PIN-PMN-PT), have been used in mechanical to electric energy translation devices, such as for high-frequency imaging and underwater detection. However, low temperature usage remains a problem for high temperature applications, which are restricted by rhombohedral to tetragonal phase temperatures (T (R-T)). In this work, we synthesized a new xPb(Yb1/2Nb1/2)O-3-yPb(Sc1/2Nb1/2)O-3-0.37PbTiO(3) (x = 0.2(similar to)0.45) (xPYN-yPSN-0.37 P T) ternary piezoelectric polycrystalline with high T (R-T) = 225(similar to)245 degrees C. For 0.45PYN-0.18PSN-0.37 P T ceramics, the piezoelectric coefficient d(33), mechanical coupling factors k(33), k(p), and k and dielectric coefficients epsilon(r) and T (R-T) are on the order of 330 pm/V, 68.3%, 54.3%, 49.3%, 930, and 245 degrees C, respectively. Thermal piezoelectric and ferroelectric behaviors were investigated in 0.45PYN-0.18PSN-0.37 P T polycrystalline, which are good candidates for high temperature piezoelectric application. DSC curves for xPYN-yPSN-0.37 P T systems present two peaks at 1213 and 1291 degrees C during the cooling process, showing good crystallization behavior and suitability for single crystal growth.