Controllable synthesis, formation mechanism and magnetic properties of hierarchical ¦Á-Fe₂O₃ with various morphologies

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• 作者：Xuhong Zhang^a ; ^b ; ^c ; Yanzhuo Chen^c ; Hui Liu^c ; ^d ; Yu Wei^c ; ^d ; ^{weiyu@mail.hebtu.edu.cn} ; ^{weiyuhebtu@163.com} ; Wei Wei^a ; ^{weiwei@sxicc.ac.cn}
• 关键词：Hematite ; Hydrothermal synthesis ; Superstructures ; Morphological control ; Magnetic properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：5 April, 2013
• 年：2013
• 卷：555
• 期：Complete
• 页码：74-81
• 全文大小：1512 K

文摘

In this paper, a simple and efficient route had been developed for morphology-controlled synthesis of hierarchical ¦Á-Fe₂O₃ superstructures assembled by nanocrystallites. All chemicals used were low-cost compounds and environmentally benign. The morphologies and structures of the ¦Á-Fe₂O₃ crystals were characterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and Fourier-transform IR spectroscopy (FTIR). The results showed that different shapes of hierarchical ¦Á-Fe₂O₃ nanostructures such as peanuts-like, capsule-like, cantaloupe-like and almond-shaped could be prepared by simply varying the concentration of silicate anions and other inorganic reagents. The as-prepared ¦Á-Fe₂O₃ architectures were composed of nanorods or nanosheets at different synthesis temperature. The possible formation mechanism was described based on the experimental results. Magnetic hysteresis measurements revealed the as-prepared superstructures displayed ferromagnetic behavior with higher remanence and coercivity at room temperature, which was attributed to the superstructure or the shape anisotropy of the samples.