Abstract
Abstract Nano-Fe particles were prepared by an arc plasma method and sintered in air atmosphere at different temperatures to obtain nano-Fe2O3. The morphology and phase structure of nano-Fe2O3 particles were studied by TEM and XRD methods. TEM results show that the shapes of Fe2O3 particles are spherical and the average particle size is about 50 nm. Also, the Fe particles sintered at temperatures below 600 °C consist of lighter cores and darker outer shells; the latter disappear at temperatures above 600 °C. XRD results show that a phase transformation from γ-Fe2O3 to α-Fe2O3 occurs with increasing temperature. α-Fe2O3 was found at temperatures as low as 200 °C but only α-Fe2O3 exists above 600 °C.
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