Abstract
We report on tunable band engineering of $\alpha-\mathrm{Fe}_{2}\mathrm{O}_{3}$ nanoparticles doping by various concentration of isostructure $\mathrm{Cr}_{2} \mathrm{O}_{3}$ . Nanoparticles are prepared by sol-gel method, and it was found to stabilize in hexagonal crystal structure with R-3C space group. The room temperature, band gap studies have shown narrowing of the band gap 2.1 eV to 1.75 eV. Compared to pure antiferromagnetic $\alpha-\mathrm{Fe}_{2}\mathrm{O}_{3}$ nanoparticles, ferromagnetism is significantly observed the doped $\alpha-\mathrm{Fe}_{2}\mathrm{O}_{3}$ . Our results improve the understanding of the structural, optical and magnetic properties of Cr doped $\alpha - \mathrm{Fe}2\mathrm{O}_{3}$ as a potential candidate for spintronic applications.
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