Ferroelectric Properties and Microstructures of La_2O_3-doped Bi_4Ti_3O_(12) Ceramics

摘要

The electrical properties of La-doped bismuth titanate, Bi_(4-x)La_xTi_3O_(12) (BLT) 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 La ions. SEM micrographs show randomly oriented and plate-like morphology. The remanent polarization (P_r) and coercive field (Ec) of the BLT ceramic with x=0.75 were above 19μC/cm~2 and 60KV/cm, respectively. The large value of remanent polarization and low coercive field of La-doped bismuth titanate ceramics promote these materials to potential applications.