The Influence of Zn Substitution on Physical Properties of CoFe 2 O 4 Nanoparticles.

Co 1- x Zn x Fe 2 O 4 nanoparticles (0 ≤ x ≤ 1) have been synthesized via a green sol-gel combustion method. The prepared samples were studied using X-ray diffraction measurements (XRD), transmission electron microscopy (TEM), Raman, and magnetic measurements. All samples were found to be single phases and have a cubic Fd-3m structure. EDS analysis confirmed the presence of cobalt, zinc, iron, and oxygen in all studied samples. Raman spectra clearly show that Zn ions are preferentially located in T sites for low Zn concentrations. Due to their high crystallinity, the nanoparticles show high values of the magnetization, which increases with the Zn content for x < 0.5. The magnetic properties are discussed based on Raman results. Co ferrite doped with 30% of Zn produced the largest SAR values, which increase linearly from 148 to 840 W/g MNPs as the H is increased from 20 to 60 kA/m.