Significantly improved Curie temperature and electrical properties of Sm-doped Pb(Ni1/3Nb2/3)O3-PbZrO3-PbTiO3 by introducing Pb(Mg1/3Nb2/3)O3
Pb(Ni1/3Nb2/3)O3-PbZrO3-PbTiO3 (PNN-PZ-PT) is one of the typical relaxor-PT piezoelectric systems. In order to further improve its Curie temperature (Tc) and piezoelectric properties, nominal Pb(Mg1/3Nb2/3)O3 (PMN) is introduced into 2mol% Sm-doped 0.36PNN-0.28PZ-0.36PT to form a (0.36 − x)PNN-xPMN-0.28PZ-0.36PT:0.02Sm (x = 0–0.24) quaternary solid solution. The phase, microstructure, domain structure, and electrical properties of the solid solution ceramics were investigated systematically. All the samples exhibit a single phase perovskite structure and are situated around the rhombohedral-tetragonal morphotropic phase boundary. With increasing x, the Tc increases gradually, while the piezoelectric coefficient d33 increases initially and decreases subsequently, reaching a peak value of 725 pC N−1 at around x = 0.15. In particular, this optimal composition illustrates high performance with Tc = 176 °C, planar electromechanical coupling factor kp = 0.63, remanent polarization Pr = 30 μC cm−2, and coercive field Ec = 8.9 kV cm−1. This study illustrates the viability of incorporating PMN into PNN-PZ-PT to optimize the comprehensive electrical properties, potentially offering a valuable guide for developing high performance relaxor-PT materials.
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