Structural and Electrical Properties of Er₂O₃‐Doped Na_1/2Bi_1/2TiO₃ Lead‐Free Piezoceramics

Abstract

Sodium bismuth titanates Na 1/2 Bi 1/2 TiO 3 (NBT) doped with 0-3 wt% Er 2 O 3 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 Er 31 concentrations ranging from 0 to 1 wt%. At a low Er 2 O 3 concentration, the Er-doped NBT ceramics showed enhanced electrical properties with dielectric constant e 33 T / e 0 5 636, a low dielectric dissipation factor (tan d 5 3.3%), a low coercive field (E c 5 4.56 kV/mm), and a high piezoelectric constant (d 33 5 75 pC/N). The relationship between the composition and properties of Er-doped NBT ceramics has been discussed.

Structure and electrical properties of Nd2O3-doped 0.82Bi0.5Na0.5TiO3–0.18Bi0.5K0.5TiO3 ceramics

“…Li et al [9] found that CeO 2 doping could reduce the coercive field E c and improve the piezoelectric properties of Bi 0.5 Na 0.44 K 0.06 TiO 3 ceramics. Wu et al [10] reported that at a low Er 2 O 3 concentration, the Er doped BNT ceramics showed enhanced electrical properties with a low dielectric dissipation factor, a low coercive field and a high piezoelectric constant. Herabut demonstrated that dielectric, piezoelectric and electromechanical properties could be improved by doping appropriate amount of La in (Bi 0.5 Na 0.5 ) (1 À 1.5x) La x TiO 3 system [11].…”

Up-conversion luminescence and electric properties of Tm3+/Yb3+ co-doped (0.94Na0.5Bi0.5TiO3–0.06BaTiO3) ceramics

“…At the same time, dielectric loss is found to be significantly high at room temperature and decreases sharply with the temperature increasing in the range of 50-400°C. [19,20]. At the same time, ferroelectric and dielectric performance correspond to each other.…”

The down-conversion and up-conversion photoluminescence properties of Na0.5Bi0.5TiO3:Yb3+/Pr3+ ceramics

“…[1][2][3] Ferroelectrics are multifunction materials, exhibiting excellent piezoelectric, ferroelectric, and pyroelectric performances. Researchers have revealed that piezoelectric, ferroelectric, and optimal photoluminescence (PL) properties of the ferroelectric materials could be enhanced by RE doping.…”