The fatigue resistance of pseudo-ternary single crystal 0.22Pb(In_1/2Nb_1/2)O₃-0.53Pb(Mg_1/3Nb_2/3)O₃-0.25PbTiO₃ (PIMNT) is tested by a “two-step poling process” – alternate current poling (ACP) with different cycles followed by direct current poling (DCP). The remnant polarization of the hysteresis loop decreases significantly and then does not change, and the coercive field raises with increasing polarization cycles. However, the two-step poling process contributes to the optimization and stability of fatigue resistance. Before 700 cycles, the piezoelectric constant d₃₃ of the crystal is obviously promoted compared with the conventional DCP sample of d₃₃ = 2200 pC/N, which increases by 40.9%–3100 pC/N, while the average thickness mode electromechanical coupling coefficient K_t remains at 0.518. With the increase in number of polarization cycles, the d₃₃ and K_t are larger and more stable than for the ACP only sample. This improvement is due to nanoscale denser and smaller domains induced by the two-step poling process.

伪三元单晶 0.22Pb(In _1/2 Nb _1/2 )O ₃ -0.53Pb(Mg _1/3 Nb _2/3 )O ₃ -0.25PbTiO ₃ (PIMNT)的耐疲劳性通过“两步极化过程”——具有不同周期的交流极化 (ACP)，然后是直流极化 (DCP)。磁滞回线的剩余极化显着降低后不再变化，矫顽场随着极化周期的增加而升高。然而，两步极化过程有助于疲劳抗力的优化和稳定性。在 700 次循环之前，压电常数 d ₃₃与d ₃₃  = 2200 pC/N的常规DCP样品相比，晶体的厚度明显提高，增加了40.9%–3100 pC/N，而平均厚度模式机电耦合系数K _t保持在0.518。随着极化循环次数的增加，d ₃₃和K _t比仅有ACP 的样品更大且更稳定。这种改进是由于两步极化过程引起的纳米级更密集和更小的域。