The single-phase multiferroic Bi_(5)Fe_(1−x)NixTi_(3)O_(15)(BFNT-x,x=0,0.1,0.2,0.3,0.4,and 0.5)ceramics were synthesized by a sol-gel auto-combustion method,and their microstructures,ferroelectric,magnetic,and dielect...The single-phase multiferroic Bi_(5)Fe_(1−x)NixTi_(3)O_(15)(BFNT-x,x=0,0.1,0.2,0.3,0.4,and 0.5)ceramics were synthesized by a sol-gel auto-combustion method,and their microstructures,ferroelectric,magnetic,and dielectric properties were investigated in detail.All samples belong to layer-perovskited Aurivillius phase containing four perovskite units sandwiched between two Bi-O layers.Ni substitution can not only improve ferroelectricity but also enhance the magnetic properties.The BFNT-0.2 sample shows the largest remnant polarization(2Pr∼11.6µC/cm^(2))and the highest remnant magnetization(2Mr∼0.244 emu/g).The enhancement of the magnetic properties may mainly originate from the spin canting of Fe/Ni-O octahedra via Dzyaloshinskii-Moriya(DM)interaction.In order to explore the influence of valance state of magnetic ions on the properties,the x-ray photoelectron spectroscopy was carried out.Furthermore,structural,ferroelectric,and magnetic transitions were also investigated.展开更多
文摘The single-phase multiferroic Bi_(5)Fe_(1−x)NixTi_(3)O_(15)(BFNT-x,x=0,0.1,0.2,0.3,0.4,and 0.5)ceramics were synthesized by a sol-gel auto-combustion method,and their microstructures,ferroelectric,magnetic,and dielectric properties were investigated in detail.All samples belong to layer-perovskited Aurivillius phase containing four perovskite units sandwiched between two Bi-O layers.Ni substitution can not only improve ferroelectricity but also enhance the magnetic properties.The BFNT-0.2 sample shows the largest remnant polarization(2Pr∼11.6µC/cm^(2))and the highest remnant magnetization(2Mr∼0.244 emu/g).The enhancement of the magnetic properties may mainly originate from the spin canting of Fe/Ni-O octahedra via Dzyaloshinskii-Moriya(DM)interaction.In order to explore the influence of valance state of magnetic ions on the properties,the x-ray photoelectron spectroscopy was carried out.Furthermore,structural,ferroelectric,and magnetic transitions were also investigated.
