Structural, Optical, Impedance, and Relaxation Investigations of BaBi_1.6Fe_0.4TiO₆ Double Perovskite

A usual solid-state reaction method was evolved to fabricate BaBi_1.6Fe_0.4TiO₆ ceramic oxide at a higher calcination temperature (1000 °C). The initial crystal structure information reveals that the material has dual-phase bearing tetragonal (P4mm) and monoclinic (P121/c1). The material also possesses a tensile strain (0.915) which has been verified by using the Williamson–Hall (W–H) plot. The compound has different functional groups and vibrational modes like a usual perovskite oxide. The optical property of the compound has been studied by UV–Vis spectroscopy, and it is found 2.67-eV bandgap. The result of the UV–visible study suggests that the material can be used as source material in photovoltaic and photocatalytic applications. Complex impedance and modulus spectroscopic verification revealed a semiconducting property and non-Debye behavior.