LAUSR

Abstract New morphotropic phase boundary (MPB) compositions with relatively high T c s were projected in Pb(In 1/2 Nb 1/2 )O 3 –Pb(Sc 1/2 Nb 1/2 )O 3 –PbTiO 3 (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 T r-t on the order of 189–210 °C, Curie temperatures T c on the order of 274–285 °C and piezoelectric coefficients d 33 in the range of 310–360 pC/N, were achieved in x PIN– (1 −  x )PSN–0.37PT ( x  = 0.15–0.23) ceramics, demonstrating a promising relaxor–PbTiO 3 system with high phase transition temperatures. In addition, the maps of T c , T r-t , d 33 and e r 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.