Abstract
Bi1-xCexFeO3 (x = 0, 0.05, 0.10, 0.15 and 0.20) ceramics were synthesized using solid state reaction method followed by rapid liquid phase sintering. The influences of Ce doping on the microstructure, electrical and magnetic properties of BiFeO3 (BFO) ceramics have been investigated. The XRD results indicate that Ce doing induce a structural transition from rhombohedral to cubic in Bi1-xCexFeO3, and the impurity phases decrease and almost vanish when the Ce doping content above 0.15. SEM analysis shows the decrease of grain size in Bi1-xCexFeO3 with increasing Ce content. Positron annihilation lifetime measurements reveal that cation vacancy-type defects exist in all samples, the open volume of vacancy-type defect increases with increasing Ce content. The vacancy concentration increases with increasing Ce content from 0.00 to 0.15, while decreases with increasing Ce content from 0.15 to 0.20. Electrical and magnetic measurements show that the dielectric, ferroelectric and magnetic properties of BFO can be improved by doping with an appropriate amount of Ce. These results are interpreted by means of the subtle change in the structure, reduction of oxygen vacancies and the level of cation vacancy concentration in the doped samples.
Published Version
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