Correlating Structural, Linear And Nonlinear Optical Properties Of MnFe₂O₃ Doped With Different Concentrations Within 8-Hydroxyquinolinato: A Comparative Analysis

8-hydroxyquinlinato (8-Hq) compounds have been utilized in applications like energy storage, electrochemical processes, sensing, and electromagnetic shielding, prompting researchers to enhance its properties. In this study, we incorporated nano-sized MnFe₂O₃ at concentrations if 1, 3, and 5 wt% into 8-HQ called (8-HQ@MnFe₂O₃). Subsequently, we have analyzed the pure and doped material using scanning electron microscopy (SEM), X-ray diffraction (XRD), Thermal Gravimetric Analysis (TGA), and Fourier-transform infrared spectroscopy (FTIR) to confirm the successful integration of 8-HQ with MnFe₂O₃. XRD patterns reveal that the doping of MnFe₂O₃ acted to increase the crystalline size till it reached 45.5 nm which is considered a promising size for optical applications. The TGA analysis showed that when 8-HQ was doped with MnFe₂O₃ nanoparticles, the interaction between the two components at the interface improved. Consequently, the composite demonstrated a more stable matrix structure and increased thermal stability. 8-HQ optical band gap was affected by MnFe₂O₃ doping, it was decreased by about 23%. Additionally, it was noted that the addition of MnFe₂O₃ as a dopant affected all optical properties, including the refractive index, expansion and dielectric coefficients. Moreover, the values of the third-order nonlinear optical susceptibility decreased with an increase in MnFe₂O₃. The results from our research indicate that 8-HQ@ MnFe₂O₃ has great potential for various applications including optical sensors and optoelectronics.