In this research, a novel chromium-iron oxide (Cr2Fe6O12) nanoparticle with rhombohedral symmetry was prepared by a simple thermal treatment method. The products were well characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). The samples demonstrated unpaired electron spins, which was confirmed by using electron paramagnetic resonance (EPR) spectroscopy.
