Optical, impedance, and relaxation response of Fe3+ doped double perovskite solid solution

In this report, the effect of Fe3+ incorporated BaBi1.8Fe0.2TiO6 on structural, vibrational, optical, impedance, modulus, and ferroelectric responses was discussed. According to X-ray diffraction (XRD) and scanning electron micrograph (SEM) analysis, the crystal structure is monoclinic single-phase polycrystalline. The vibrational property by the Fourier Transform Infrared (FTIR) spectra has a different mode of symmetric and antisymmetric vibrations which usually shows in a perovskite compound. The UV-visible study outlines strong absorption and weak reflection near UV and the visible spectrum has a cutoff wavelength of 560 nm. The direct band gap energy in the absorbance spectra was 2.70 eV based on the Tauc method. The Diffused Reflectance Spectroscopy (DRS) method also revealed the direct band gap energy in the reflectance spectra as Eg = 2.84 eV. Both the resulting bandgap energies are closer and suggest their application in photocatalytic activities. The complex impedance and modulus spectroscopy support the semiconducting nature and non-Debye kind relaxation phenomenon in the compound. The appearance of a PE hysteresis loop with RT non-zero remanent polarization justifies the ferroelectric nature of the compound, are suitable for the memory storage application.