Revived BBFTO double perovskite with improved dielectric properties for some possible device applications

A solid-state reaction procedure was followed to synthesize the BaBi_1.4Fe_0.6TiO₆ ceramic. To compensate for the Bi³⁺ evaporation during the high-temperature sintering process, more Bi³⁺ content was so selected, further, it adds more promising ferroelectric and dielectric orders. The monoclinic crystal system formation was checked by the X-Ray Diffraction and Rietveld refinement methods. The average crystallite size is 37.46 nm, while the average grain size is 137.28 nm, which implies that a single grain might have contained some single-phase crystallites. The Energy-Dispersive X-Ray spectrum confirmed the sample’s elemental purity. The material belongs to a perovskite phase, which was supported by some appeared usual vibrational modes in the Fourier-Transform Infrared analysis. The UV–Visible absorbance property results cutoff wavelength of 590 nm and the optical direct bandgap E_g = 2.53 eV. The remanent magnetization of 2P_r = 0.782µC/cm² supports the ferroelectric nature. The room temperature (RT) dielectric parameter at 100 Hz has a higher ɛ_r (1408) and lower tanδ (0.24) as well as a higher transition (T_d > 350 °C) and Curie temperature (T_c > 485 °C). Deviation from the Debye-type relaxation process and semiconducting nature were observed in the sample. The conductivity nature is obedient to the Arrhenius law, which results in dc conductivity activation energy, E_a = 0.94 eV.