Effect of La/Mn substitution on electrical properties of BiFeO3 multiferroics

The polycrystalline fine powder (∼60 nm) of Bi0.90La0.10(Fe1-xMnx)O3 (x= 0, 0.05, 0.10 and 0.20) have been synthesized by mechanical activation and mixed oxide methods. Preliminary structural analysis using X-ray diffraction exhibits formation of the single-phase compound in a hexagonal (distorted perovskites system). Detailed dielectric studies as a function of temperature show that dielectric constant of BFO (BiFeO3), and also tanδ increase significantly on increasing Mn content in BiLa(FeMn)O3 system. Impedance analysis of the system provides many interesting results. (author)