Abstract
Gram quantities of γ-Fe2O3 nanopowders having mean particle size of 20±4nm were synthesized using a hydrothermal method and then consolidated into dense nanostructured compacts by spark plasma sintering (SPS) at relatively low temperatures: 300–350°C. The cubic spinel structure of the as-synthesized γ-Fe2O3 nanoparticles (NPs) did not get altered by the SPS process; nevertheless, a moderate increase in their grain sizes was evident in the SPSed compacts (80–125nm). The physical properties such as density (ρ), coercivity (Hc) and magnetization (Ms) values of γ-Fe2O3 NPs were affected by the SPS temperature. Significantly, higher values of ρ (4.45g/cm3), Hc (274Oe) and Ms (67.2emu/g) were achieved for the bulk compact SPSed at 350°C. This work highlights the merits of sintering γ-Fe2O3 NPs by SPS –as a new method of compaction with useful magnetic properties; which cannot be realized with the conventional sintering techniques.
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