Abstract
In this study, a three-dimensional α-Fe2O3 nanomaterial (abbreviated as 3D-Fe2O3) with frame architecture was synthesized by an easy and scalable self-assembly route. The distortion and asymmetric covalent Fe–O bonding were generated during the self-assembly process between α-Fe2O3 nanocrystalline (20–50 nm) of 3D-Fe2O3 annealed at 773 K, indicating a transition from anti-ferromagnetic to ferromagnetic order at room temperature (293 K). About 7.157–15.156 wt.% α-Fe2O3 transformed into γ-Fe2O3 from 823 to 923 K, enhancing the ferromagnetic performances. The maximum magnetization (Mm) reached 9.05–8.94 emu/g at temperatures of 273–303 K, values about 40-fold higher than those of α-Fe2O3 nanoparticle (20–50 nm).
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