(0.98 − x)Bi(Sc3/4In1/4)O3–xPbTiO3–0.02Pb(Mg1/3Nb2/3)O3 (BSI–xPT–PMN, x = 0.56–0.60) ternary solid solutions near the morphotropic phase boundary (MPB) have been designed and prepared using the two-step columbite precursor method. Microstructural morphology, phase transition, and electrical properties of the BSI–xPT–PMN ceramics were investigated in detail. X-ray powder diffraction analysis indicated that the BSI–xPT–PMN ceramics were of pure perovskite phase, and the MPB between the rhombohedral and tetragonal phases located at x = 0.58, which are also confirmed by their compositional dependence piezoelectric and electromechanical properties. The piezoelectric properties were enhanced significantly by the introduction of a small amount of PMN, and the piezoelectric constant d33 is doubled that of the binary Bi(Sc3/4In1/4)O3–PbTiO3 system. The optimal piezoelectric properties were obtained for the MPB composition 0.40BSI–0.58PT–0.02PMN, which exhibits a piezoelectric constant d33 of 403 pC/N, planar electromechanical coupling factor kp of 47.2 %, remnant polarization Pr of 36.4 µC/cm2, and Curie temperature Tc of 421 °C. Additionally, the BSI–xPT–PMN systems reduce the content of Sc2O3 in comparison with the BS–PT systems. The enhanced piezoelectric performance, together with the good thermal stabilities, makes the BSI–xPT–PMN ceramics promising candidates for high temperature piezoelectric applications.
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This work was supported by the National Natural Science Foundation of China under the Grant Nos. 51132001 and 50902087, the Natural Science Foundation of Shandong Province of China under the Grant Nos. ZR2012EMQ005 and ZR2014EMM012, and a foundation under the Grant No. 2015JMRH0103.