Synthesis and mechanical/magnetic properties of nano-grained iron-oxides prepared with an inert gas condensation and pulse electric current sintering process |
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Authors: | Yong-Ho Choa Tatachika Nakayama Tohru Sekino Koichi Niihara |
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Affiliation: | (1) Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, 567-0047 Osaka, Japan |
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Abstract: | Nanocrystalline iron-oxide powder was fabricated with an inert gas condensation (IGC) method combined with evaporation, and
in-situ oxidation techniques. The particle size of iron-oxide powder was controlled by varying the helium gas pressure between
0.1 and 10 Torr, with the smallest one =10 nm at 0.1 Torr. The nanostructure was characterized by TEM. Nanocrystalline iron-oxide
powder was sintered with the pulse electric current sintering (PECS) method to obtain densified γ-Fe2O3 materials, and suitably densified nano-grained γ-Fe2O3 materials (≈ 40 nm) of great hardness were obtained. The correlation between the nanostructure and magnetic properties of
nanocrystalline powder and densified γ-Fe2O3 materials was also investigated. |
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Keywords: | nanostructure inert gas condensation method pulse electric current process magnetic property mechanical property |
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