Influence of iron deficiency on electric and magnetic behavior of Ho doped BiFeO_3 electroceramic

摘要

The effect of iron deficiency for the improvement of multiferroic properties of Ho doped BiFeO_3 ceramics (BiHo_xFe_(1-x)O_3 for x = 0, 0.05, 0.1 and 0.15) prepared by conventional solid state reaction route were investigated carefully. As pure BiFeO_3 exhibited antifer-romagnetism, lossy ferroelectric (P-E) hysteresis loop and low dielectric constant value so, device integration is significantly hindered due to the presence of impurity phases associated with it. However, suitable variation of metal ion concentration in Ho doped BiFeO_3 significantly enhanced both ferroelectric and ferromagnetic properties of the samples. Therefore, increase of Ho concentration certainly favors for suppression of impurity phases in rhombohedral (R3_c) structure of BiFeO_3 along with no structural transformation. On the other hand, increase of iron deficiency may suppress transformation of Fe from Fe~(3+) to Fe~(2+) as a result, the dielectric constant value of the sample increases along with large reduction of leakage current behavior.