Alternating current poling on sliver-mode rhombohedral Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals

Sliver-mode 0.73Pb(Mg1/3Nb2/3)O3-0.27PbTiO3 single crystals were poled by the alternating current electric field (ACP) along [001] direction for low-frequency transducer applications. Under ACP with optimized conditions (2.89 kVrms, 0.1 Hz, 10 cycles), free dielectric constant (?T33/?0) was enhanced from 5300 to 7220 and piezoelectric coefficient (d33) improved 1410 1920 pC/N, both are about 36% higher than those under traditional direct poling. The piezoresponse force microscopy observation phase-field simulation show similar domain morphologies evolution. During process, morphology first changes ‘4R’ ‘2R’ configuration, then length of 109° wall keeps increasing, which leads a longer range ordering stable lamellar structure in end. correlation between coercive is also found experiment simulation. These findings on effect mechanism will help develop advanced crystal arrays.