Fabrication of a novel chromium-iron oxide (Cr2Fe6O12) nanoparticles by thermal treatment method

• An aqueous solution of PVA and metal nitrates consist of Fe (NO3)3·9H2O and Cr (NO3)3·9H2O was prepared at 353 K
• The mixed solution was heated at 373 K to evaporate the water and the resulting solid was crushed to powder
• The influence of calcination temperature on structure and magnetic properties of a novel chromium-iron oxide (Cr2Fe6O12) nanoparticle was characterized

In this research,a novel chromium-iron oxide (Cr2Fe6O12) nanoparticle with rhombohedral symmetry was prepared by a simple thermal treatment method.Heat treatment was conducted using an electric cylinder furnace in an air atmosphere at temperatures between 773 and 923 K, where the produced chromium-ironoxide nanoparticles had different crystallite sizes ranging from 9 to 20 nm. The products were well characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscope (FESEM), X-ray analysis (EDXA), and Fourier transform infrared spectroscopy (FT-IR). The samples demonstrated a magnetic behavior with unpaired electron spins, which was confirmed by using vibrating sample magnetometer (VSM) and electron paramagnetic resonance (EPR) spectroscopy.