Recently multiferroic materials have attracted

On the other hand, although the spontaneous polarization of BiFeO3 has been predicted to be as high as 100 μC/cm2 by first principles calculation [10], it often shows a small polarization one order of magnitude lower than the theoretical value due to sizable leakage current. In this respect, A and B site substitution has also been proved an effective way to reduce the leakage current, such as Ca, Sr, Ba, Pb and La at A- site [11] or Cr, Mn and Ti at B-site [12] of BiFeO3.