Crystal orientation dependence of dielectric and piezoelectric properties of tetragonal Pb(Mg1/3Nb2/3)O3–38%PbTiO3 single crystal

Abstract The crystallographic orientation dependence of the P–E behavior and dielectric and piezoelectric properties in tetragonal Pb(Mg1/3Nb2/3)O3–38%PbTiO3 (PMNT62/38) single crystals were investigated. When the electric field was applied to 15 kV/cm the coercive electric fields Ec varied from E c [0 0 1] ∼8.25 to E c [1 1 0] ∼6.80 to E c [1 1 1] ∼4.11 kV/cm and the remnant polarizations were P r [0 0 1] ∼34.25 , P r [1 1 0] ∼22.64 , and P r [1 1 1] ∼18.87 μC/cm2. In [1 1 0] and [1 1 1] poled crystals, the formation of the engineered domain configuration caused more enhanced dielectric and piezoelectric activities: d 33[1 1 0] ∼1350 pC/N and e r [1 1 0] ∼6972 ; d 33[1 1 1] ∼980 pC/N and e r [1 1 1] ∼9784 , compared with d 33[0 0 1] ∼350 pC/N and e r [0 0 1] ∼760 at room temperature.