Structural and Electrical Properties of Er2O3-Doped Na1/2Bi1/2TiO3 Lead-Free Piezoceramics.

Sodium bismuth titanates Na_1/2Bi_1/2TiO₃ (NBT) doped with 0–3 wt% Er₂O₃ were prepared by the conventional solid-state reaction method. The X-ray diffraction results revealed that the sintered Er-doped NBT ceramics exhibited a pure perovskite structure with Er³⁺ concentrations ranging from 0 to 1 wt%. At a low Er₂O₃ concentration, the Er-doped NBT ceramics showed enhanced electrical properties with dielectric constant ℇ₃₃^T/ℇ₀=636, a low dielectric dissipation factor (tan δ=3.3%), a low coercive field ( E_c=4.56 kV/mm), and a high piezoelectric constant ( d₃₃=75 pC/N). The relationship between the composition and properties of Er-doped NBT ceramics has been discussed. [ABSTRACT FROM AUTHOR]