The effect of cooling rate on structural and electrical properties of multiferroic BLF-PT ceramics

The solid solutions of 0.57(Bi 0.8 La 0.2 )FeO 3 -0.43PbTiO 3 (BLF-PT) were prepared by the solid-state reaction process. The as-sintered ceramics were annealed at 350°C and then cooled in different media. BLF-PT ceramics cooled in boiling water (BW) and NaCl solutions exhibit the rhombohedral structure with higher domain density, while the tetragonal structure was observed in the specimen cooled in the furnace. Moreover, BLF-PT ceramics cooled in BW with cooling rate of about 10°C/s exhibit the enhanced electrical properties with dielectric constant ε r , remnant polarization P r , piezoelectric constant d 33 of 940, 28 μC/cm 2 and 210 pC/N, respectively. Rayleigh analysis was utilized to study of domain wall motion of BLF-PT ceramics cooled in different media.