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Sri Budiawanti,R. Amalia,D. T. Rahardjo,Suharno,B. Purnama,D. Djuhana 한국자기학회 2022 Journal of Magnetics Vol.27 No.1
We prepared and characterized nickel-substituted cobalt ferrite (Ni0.1Co0.9Fe₂O₄) nanoparticles using the sol-gel method. The physical properties of the nanoparticles have been modified by postannealing treatment at atmospheric conditions. X-ray diffraction results confirmed that the nanoparticles possessed a single-phase face-centered cubic crystalline structure. The crystallite sizes increased from 20.85 to 26.06 nm with the increased annealing temperature. Transmission electron microscopy results confirmed the crystal structure of the nickel-substituted cobalt ferrite nanoparticles. Furthermore, Fourier-transform infrared spectroscopy results showed that the typical characteristic absorption of the nanoparticles was obtained at wave numbers k = 575 and 374 cm<SUP>−1</SUP>. Finally, the saturation magnetization and coercivity of the nanoparticles increased with the annealing temperature, which is attributed to the increase in magnetic anisotropy constant.