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Facile synthesis and characterizations of Co2+ doped Bi0.8Ba0.2FeO3 nano-crystalline multiferroic ceramics

Barium doped BiFeO3 and Cobalt doped Bi0.8Ba0.2FeO3 (BBFO) nanocrystalline multiferroic ceramics were prepared by the sol-gel technique. Rhombohedral symmetry was observed throughout the compositions, and the effect of sintering temperature was observed on volume and grain size of BBFO at (400 °C–700 °C) using x-ray profiles. The final sintering temperature for Cobalt doped (BBFCO) was estimated by using thermal analysis. DC I-V (current-voltage) analysis was used to analyze the leakage current density and conduction mechanism of ceramics. The temperature-dependent electrical resistivity measurements confirmed the metallic behaviour of Co2+ doped BBFO multiferroics at low temperatures, and transition temperature TMI was also found to be Cobalt concentration-dependent. The dielectric response, electrical impedance, and Modulus of the material were measured in the frequency range 100Hz to 2MHz at room temperature. Trends or occurrences may be attributed to oxygen vacancies arise due to doping content.