A novel chemical reduction route toward fabrication of Fe3O4 octahedrons and Fe tubes
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Novel Fe3O4 octahedrons and Fe microtubes were successfully prepared in different alkaline concentration solutions by the reduction of hematite (α-Fe2O3) with hydrazine hydrate. The as-prepared powders were characterized in detail by conventional techniques such as X-ray diffraction and field emission scanning electron microscopy. The role of alkaline concentration during the reaction process is discussed in detail. Compared to the reaction in a water system, the reaction in ethanol required less sodium hydroxide and smaller particles were obtained. In addition, the magnetic properties of the samples were characterized using a vibrating sample magnetometer.
KeywordsMagnetite Hematite Hydrazine Hydrate Shape Anisotropy Magnetic Refrigeration
This work was supported by a Grant-in-aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS), the CREST program of the Japan Science and Technology Agency (JST), the National Natural Science Foundation of China (No. 50873042), and the Scientific Research Program of the HuaiHai Institute of Technology (KQ08023, Z08018). We are grateful to the young and middle-aged academic leaders of the “Blue and Green Blue Project” of the universities and colleges in Jiangsu Province. We are also grateful to the University of Science & Technology of China for assistance in XRD and SEM measurements.
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