Abstract
In this present investigation, we have performed a systematic study to determine the suitability of chromium oxide (Cr2O3) as diluted magnetic oxide (DMO). Pristine Cr2O3 and Ni2+ ion-doped nanoparticles synthesized via a cost-effective, simple co-precipitation method. XRD studies with Raman and FT-IR confirm that Cr2O3 nanoparticles with Ni2+ ions doping exhibiting rhombohedral structure without the presence of any secondary phase. The TEM micrographs confirm the formation of highly crystalline pristine and Ni2+ ions doped Cr2O3 nanoparticles, whereas SAED and HRTEM confirm the rhombohedral structure of pristine and Ni2+ ions doped Cr2O3 nanoparticles in accordance with XRD results. X-ray Photoelectron Spectroscopy (XPS) confirms Ni2+ ions are successfully doped in Cr2O3 lattice structure and also reveals the presence of oxygen defects. UV–Vis absorption and tauc's plot illustrates marginal red shift in the optical bandgap from 2.85 eV (Pristine Cr2O3) to 2.75 eV (x = 0.07) with Ni doping. Magnetic measurement of pristine and Ni doped Cr2O3 nanoparticles carried out at room temperature depicts the presence of weak room temperature ferromagnetism (RTFM). Magnetic behavior in pristine Cr2O3 nanoparticles is attributed to mixed-valence state and surface effect. With the Ni doping, Cr2O3 nanoparticles, magnetic behavior is associated with induced exchange interaction with oxygen defects. Bound Magnetic Polarons (BMP) model was employed to calculate the defect's density and to explain magnetic behaviors in the doped powder samples.
Published Version
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