Effect of Zn and Ti Co-doping on structure and electrical properties of BiFeO3 ceramics

Dielectric, ferroelectric and magnetic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics prepared at different sintering conditions

“…The saturation magnetization increases first and then decreases with increasing the sintering time. The maximal remnant magnetization is about 0.14 emu/g when the sintering time is 2 h. This enhancement of the magnetization is larger than La and Sm doped BFO ceramics but it is consistent with the Ti doped BFO [27,28]. It is well known that, BFO is a G-type antiferromagnetic helical structure whose magnetism is derived from the atomic magnetic moment.…”

“…In this paper, we report the improved multiferroic properties of La, Sm and Ti co-doped BFO ceramics by appropriate sintering schedule, where La doping at the A site can reduce the leakage current, Sm doping at the A site can enhance ferroelectric properties, and Ti dop-ing at the B site can improve magnetic properties [23][24][25][26][27][28]. The phase and morphology evolution of BFO with respect to the different sintering time as well as their influence on the physical properties such as electrical and magnetic properties of BFO have also been systematically discussed.…”

Enhanced magnetic properties of cobalt-doped bismuth ferrite nanofibers

“…Compared to the pure BFO nanofibers, it can be observed that the two major peaks, assigned to (104) and (110) planes, have slightly shifted towards higher diffraction angle values with the increasing of Cobalt concentration. This result is differing from other element doping samples (such as Y 3+ [31], Zn 2+ and Ti 4+ [17], La 3+ [32] ), which two major peaks are moving towards to the higher angle side and having merge trends with the doping element increasing [33]. It can be used a variation of Goldschmidt tolerance factor to explain as follow [17]: and + r Co 3 assigned to the radius of the Bi 3+ , O 2− , Fe 3+ and Co 3+ ions, respectively.…”

“…The strong and sharp diffraction peaks indicated good crystallinity of the samples in the patterns of the nanofibers. A small quantity of the impurity phase that identified as Bi 2 Fe 4 O 9 [15] and Bi 25 FeO 40 [29] were also detected, which could be the metastable phase come from the BFO-based materials synthesis process [17,30]. The views of the XRD patterns (2θ from 31.5°to 33.5°) was enlarged in the figure 4 (bottom).…”

“…Xie et al [15] prepared pure BFO nanofibers by the sol-gel electrospinning and studied the ferroelectric and ferromagnetic properties. On the other hand, Chemical substitution of BFO at Bi and Fe sites is also found to cause changes to the lattice and modulated the spin structure of BFO, thereby enhancing magnetic properties [17,18]. There has been a continuous effort to enhance the magnetoelectric properties of BFO by doping transition metal ions (Co, Mn, Zn, etc) at Fe sites.…”