Synthesis, optical bandgap analysis, and refractive index study of Ba0.5Sr0.5Fe12O19 hexaferrite via sol–gel auto-combustion for multifunctional optoelectronic applications

During the last few years, new materials for multifunctional optoelectronic applications have been developed with the aim of generating eco-friendly and renewable solar energy, therefore reducing the cost of electricity production and improving luminous efficiency through a simple manufacturing process. In the present work, the nano powder Ba 0.5 Sr 0.5 Fe 12 O 19 hexaferrite sample was successfully synthetized via the sol gel auto-combustion process and was characterised by room temperature X-ray diffraction (XRD) and UV–Visible-NIR spectroscopy. The structural study proved that the studied sample crystallises according to the hexagonal system with the (P6 3 /mmc) space group. The spectral behaviour of absorbance proves that the studied sample exhibits a broad absorption in the UV–Visible light region as well as a tunable direct optical gap of 1.81 eV. Further analysis of the extinction coefficient, refractive index, dispersion parameters, optical dielectric constant, nonlinear optical parameters as well as optical conductivity were highlighted and investigated in order to undertake a deeper and better insight into the optoelectronic behaviour of hexaferrite compound. The obtained results place emphasis on a powerful luminous efficiency as well as the suitability of the studied Ba 0.5 Sr 0.5 Fe 12 O 19 hexaferrite compound for the manufacture of optoelectronic devices.