Abstract
Herein a one-step, easy, cheap and eco-friendly Solvothermal synthesis method has been used to synthesize monodisperse, uniform and ultrasmall chromium oxide (Cr2O3) nanocrystals (NCs). Transmission electron microscope (TEM) image of as-prepared Cr2O3 NCs shows the spherical shape with a uniform size of ∼4.5 nm. The oxidation state of chromium ion has confirmed by absorption as well as electron paramagnetic resonance (EPR) spectroscopy. Magnetic properties of as-synthesized NCs show low-temperature antiferromagnetic (AFM) exchange with Currie-Weiss (C-W) temperature ϴ = −160 K. Further, nearest neighbour exchange coupling constant JNN has found to be −16 K (Here K is Boltzmann constant) for Cr2O3 NCs by considering the nearest neighbours (Z) is 4.
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