Enhanced ferroelectric and ferromagnetic properties of BiFeO <sub>3</sub> ‐PbTiO <sub>3</sub> multiferroic solid solutions with Ba substitutions
Rui Peng, Jie Jian, Zhoushang Xu, Yixuan Chen, Jianguo Chen, Jinrong Cheng
Abstract
Abstract Dense 0.6(Bi 0.9 La 0.1 )(Ga 0.05 Fe 0.95 )O 3 ‐0.4(Pb 1‐x Ba x )TiO 3 (BLGF‐PBT, x = 0, 0.1, 0.2, 0.3, and 0.4) ceramics with different Ba contents were prepared by the solid‐state reaction method, and effects of Ba contents on the structure and multiferroic properties were investigated. X‐ray diffraction results indicate that the Ba‐modified BLGF‐PBT ceramics exhibit single perovskite structure without detectable secondary phases, and a transition from tetragonal phase to rhombohedral one takes place with the increase of Ba content. The piezoelectric constant d 33 , remanent polarization P r , and remanent magnetization M r are improved by the Ba substitution simultaneously. Values of P r , M r , and d 33 of BLGF‐PBT ceramics for the composition of x = 0.3 with the coexistence of tetragonal and rhombohedral phases are 20 μC/cm 2 , 0.05 emu/g, and 256 pC/N, respectively, much higher than those without Ba modification. The significantly improved d 33 and M r indicate that BLGF‐PBT ceramics with Ba modification provide alternative materials for multifunctional devices.