Effect of La Doping on the Dielectric and the Ferroelectric Properties of Lead-Free Na1/2Bi1/2TiO3 (NBT) Ferroelectric Ceramics

To investigate the effect of La-ion doping, we prepared pure Na1/2Bi1/2TiO3 (NBT) and La-doped Na1/2Bi1/2-xLaxTiO3 (NBLT) ceramics by using a solid-state reaction method. Crystallized NBT and NBLT single-phases were confirmed by using X-ray diffraction. The La doping influenced the dielectric behavior and the ferroelectric properties. With increasing La doping, the dielectric peak broadened. The ferroelectric P-E hysteresis loop changed from a leaky shape to a slim shape. The remanent polarization slightly decreased; however, the coercive electric field decreased remarkably. In this work, the La-doping effects on the dielectric and the ferroelectric properties of lead-free NBT ferroelectric ceramics were investigated by using X-ray diffraction, dielectric constant and ferroelectric P-E hysteresis loop measurements. KCI Citation Count: 8