Phase evolution and strong temperature‐dependent electrostrictive effect in (1− x )Pb(Mg 1/3 Nb 2/3 )O 3 ‐ x PbTiO 3 solid solutions

Abstract (1− x )Pb(Mg 1/3 Nb 2/3 )‐ x PbTiO 3 (PMN‐ x PT) ceramics with x ranging from 0.1 to 0.3 were synthesized by solid‐state reaction method. X‐ray diffraction, dielectric and ferroelectric property characterizations were systematically investigated. As x rises, the PMN‐ x PT transitions from a cubic to a rhombohedral phase, resulting in an enhancement in ferroelectricity. Our findings show that the electrostrain and longitudinal electrostrictive coefficient Q 33 both increase and then decrease within a critical region located between the depolarization temperature T FR and T m (corresponding to the maximum permittivity), demonstrating strong temperature‐dependent characteristics. In x = 0.2, the maximum Q 33 of 0.0361 m 4 /C 2 is obtained, and a phase diagram of studied system is built. Our findings not only shed light on the phase evolution in this system but also reveal a strong temperature‐dependent electrostrictive effect that can be used to improve electrostrains in PMN‐based solid solutions if the critical region can be regulated to a suitable temperature region using engineering strategies.