Thickness-Dependent Properties of Undoped and Mn-doped (001) PMN-29PT [Pb(Mg1/3Nb2/3)O3-29PbTiO3] Single Crystals

In order to investigate the effect of thickness on the dielectric and piezoelectric properties of (001) PMN-29PT single crystals, three different types of PMN-29PT samples were prepared using the solid-state single crystal growth (SSCG) method: high density crystal [99%], low density crystal [95%], and high density crystal doped with Mn [98.5%].When their thickness decreased from 0.5 mm to 0.05 mm, their dielectric constant (K 3 T ), piezoelectric constants (d 33 and g 33 ), and electromechanical coupling factor (k t ) decreased continuously.However, their dielectric loss (tan δ) increased.The addition of Mn to PMN-PT induced an internal bias electric field (E I ), increased the coercive electric field (E C ), and prevented local depoling.Therefore, Mn-doped PMN-PT crystals show high stability as well as high performance, even in the form of very thin plates (< 0.2 mm), and thus are suitable for application to high frequency composites, medical ultrasound probes, non-destructive testing devices (NDT), and flexible devices.