Investigation of morphotropic phase boundaries in PIN-PSN-PT relaxor ferroelectric ternary systems with high Tr-t and Tc phase transition temperatures

New morphotropic phase boundary (MPB) compositions with relatively high Tcs were projected in Pb(In1/2Nb1/2)O3-Pb(Sc1/2Nb1/2)O3-PbTiO3 (PIN-PSN-PT) solid solution based on the perovskite tolerance factor, and were experimentally confirmed. The phase structure, dielectric, pyroelectric, piezoelectric and ferroelectric properties of PIN-PSN-PT ceramics were investigated. The rhombohedral-tetragonal phase transition temperatures Tr-t on the order of 189-210 °C, Curie temperatures Tc on the order of 274-285 °C and piezoelectric coefficients d33 in the range of 310-360 pC/N, were achieved in xPIN- (1 − x)PSN-0.37PT (x = 0.15-0.23) ceramics, demonstrating a promising relaxor-PbTiO3 system with high phase transition temperatures. In addition, the maps of Tc, Tr-t, d33 and εr with respect to composition were established, based on which, a clear direction for composition screening in future crystal growth of the PIN-PSN-PT system was given