Microstructure, ferroelectric and dielectric proprieties of Bi_4Ti_3O_(12) materials prepared by two methods

摘要

Bi_4Ti_3O_(12) (BTO) materials were prepared by the sol-gel method via the acetic acid method (AAM) or the ethylene glycol method (EGM). BTO powders prepared by EGM are composed of the main phase without purity phases when annealed at 650 ℃. BTO powders prepared by AAM are composed of the main phase without secondary phases when annealed at 625 ℃. BTO ceramics prepared by AAM have denser microstructure and greater grain size than those prepared by EGM. BTO ceramics prepared by two methods exhibit well typical P-E loops for ferroelectrics. The remnant polarization of BTO ceramics prepared by AAM is greater than those prepared by EGM. And the coercive field and dielectric loss of BTO ceramics prepared by AAM are smaller than those prepared by EGM. BTO ceramics prepared by AAM have better ferroelectric and dielectric properties than those prepared by EGM.