Effect of BaTiO_3 doping on the structural, electrical and magnetic properties of BiFeO_3 ceramics

摘要

(1 - x)BiFeO_3-xBaTiO_3 (x = 0.00, 0.10, 0.20, 0.25 and 0.30) ceramics have been fabricated by the solid state reaction method. The effects of BaTiO_3 (BTO) doping on the structural, electrical and magnetic properties of BiFeO_3 (BFO) ceramics have been investigated. It is found that BTO doping can affect the structure of the BFO ceramics, and the multiferroic properties of BFO ceramics can hence be improved. The XRD measurements reveal that the structure of BFO was changed from rhombohedral to pseudo-cubic and the impurity phases were decreased both due to BTO doping. Analysis of microstructure indicates that the BTO doping can hinder the grain growth. Electrical measurements show that BFO doping improves the ferroelectric property due to the significantly decrease of the electric leakage density and the oxygen vacancy concentrations. Magnetic measurements indicate that the antiferromagnetism behavior of BFO is turned into a weak ferromagnetism state by addition of BTO. The related mechanism is also discussed in the paper.