Ferroelectric Properties and Microstructures of La2O3-doped Bi4Ti3O12 Ceramics

摘要

The electrical properties of La-doped bismuth titanate,Bi4-xLaxTi3O12 (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 (Pr) and coercive field (Ec) of the BLT ceramic with x=0.75 were above 19μC/cm2 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.