Ferroelectric Properties and Microstructures of Dy_2O_3-doped Bi_4Ti_3O_(12)Ceramics

摘要

The electrical properties of Dy-doped bismuth titanate, Bi_(4-x)Dy_xTi_3O_(12) (BDT) ceramics prepared by a conventional electroceramic technique have been investigated. XRD analyses revealed Bi-layered perovskite structure in all samples, and indicted that Bi ions were only substituted near the Ti-O octahedron layers by Dy ions. SEM micrographs show randomly oriented and plate-like morphology. The remanent polarization (P_r) and coercive field (E_c) of the BDT ceramic with x = 0.75 were above 19μC/cm~2 and 50KV/cm, respectively. The large value of remanent polarization and low coercive field of Dy-doped bismuth titanate ceramics promote these materials to potential applications.