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By carefully controlling the reaction conditions, nanowires of Fe 3 O 4 are directly acquired from nanowires of α-Fe 2 O 3 in a reduced atmosphere at 410–430°C. X-ray diffraction, Raman spectrum, and transmission electron microscopic analyses demonstrate that the product is single-crystalline Fe 3 O 4 . The nanowires have diameters of 40–90nm and lengths...
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