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In this research, zinc-iron ferrite nanoparticles were synthesized by thermal treatment method. The presence of crystalline phases by X-ray diffraction (XRD) was determined by X-ray diffraction (XRD), which confirmed the presence of crystalline phases in all nanoparticles. The particle size and morphology of the nanoparticles were obtained using Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM), respectively. The magnetic properties of nanoparticles, such as saturation magnetization (M_s) and coercivity field (H_c), and remanent magnetization (M_r) were carried-out by vibrational sample magnetometer (VSM) at room temperature which showed that zinc and iron ferrite nanoparticles had superparamagnetic and ferromagnetic behaviors, respectively. The existence of metal oxides vibration modes were confirmed by a Fourier transform infrared spectroscopy (FT-IR) in all of nanoparticles. The band gap energies were estimated by UV–vis absorption in the range of 1.98 to 2.30 eV, which confirmed Zn_1-xFe_xFe₂O₄ spinel nanostructures were semiconductors

Keywords: thermal treatment, saturation magnetization, band gap energy.

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