The crystal structure, refinement and dielectric properties of Ba and Mn substituted bismuth ferrite

The effect of Ba and Mnsubstitution on the crystal structure and dielectric properties of BiFeO3 has been studied using X-ray diffraction at room temperature, Rietveld refinement and dielectric properties measurements technique. Single phase Bi0.8Ba0.2Fe1-xMnxO3 (x= 0.01, 0.05) multiferroics have been synthesized by two stage solid state reaction method. Rietveld refinement of both the samples revealed thatthe synthesized ceramics exhibit rhombohedral structure with space group R3c as of parent BiFeO3. The dielectric response of both samples was analyzed in the frequency range 100 Hz–2 MHz at different temperatures revealing dispersion in dielectric constant (ε′) and in dielectric loss (tanδ) at lower frequencies. Both ε′ and tan δ increase with increase of Mn content.