Effect of 3 d Transition Metal Doping on Multiferroic Properties of Bi0.8Ba0.2FeO3 Ceramics

Multiferroic ceramics Bi0.8Ba0.2Fe0.9M0.1O3 (M=Cr, Mn and Ti) were prepared by a conventional solid state reaction method. The pure phase with rhombohedral perovskite structure (space group R3c) was confirmed by the X-ray diffraction measurements for all samples. The results show that the maximum value of the remnant polarization (2Pr) and the minimum value of the dielectric constant at room temperature and low frequency for Bi0.8Ba0.2Fe0.9Ti0.1O3 samples are 0.64 μC/cm2 and 140, respectively. The dielectric constant and dielectric loss decrease with increasing frequency and then become nearly constant at higher frequency for all samples. The maximum value of the remnant magnetization (2Mr) for Bi0.8Ba0.2Fe0.9Mn0.1O3 samples at room temperature is 1.46 (A•m2)/kg by the M-H loops measurements. A remarkable change in the P-E loops is observed whether a bias DC magnetic field is applied or not, directly approving the existence of magnetoelectric coupling in multiferroic ceramics Bi0.8Ba0.2Fe0.9M0.1O3 (M=Cr, Mn and Ti). And the maximum value of magnetoleectric coupling for Bi0.8Ba0.2Fe0.9Cr0.1O3 samples is 5.8 mJ/cm3.

Duke Scholars

Author Zhaohui Wang Pathology