Abstract
Abstract The mixture of α-Fe 2 O 3 and CuO crystalline powders in equimolar ratio was subjected to high-energy ball milling to investigate the solid solution process in this system. The phase evolution in the system during the milling was studied by means of X-ray diffraction and Mossbauer spectroscopy. It was found that nanostructured solid solution of CuO–α-Fe 2 O 3 with a corundum structure was obtained. Within the solid solution, there existed a gradient distribution of concentration of CuO from the surface to the interior of α-Fe 2 O 3 . The dissolution of CuO in the α-Fe 2 O 3 greatly lowered the Neel temperature of α-Fe 2 O 3 , which resulted in paramagnetism of the as-milled solid solution whose Mossbauer spectrum showed a doublet absorption line at room temperature.
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