期刊
CHEMISTRY OF MATERIALS
卷 23, 期 6, 页码 1587-1593出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm103441u
关键词
dendrite-like; microstructure; magnetic materials; microwave-absorbing materials; nanostructure
资金
- Natural Science Foundation of China (NSFC) [20901010, 20731002, 20871016, 91022006, 20973023]
- Program for New Century Excellent Talents in University
- 111 Project [B07012]
Iron-based microstructured or nanostructured materials, including Fe, gamma-Fe2O3, and Fe3O4, are highly desirable for magnetic applications because of their high magnetization and a wide range of magnetic anisotropy. An important application of these materials is use as an electromagnetic wave absorber to absorb radar waves in the centimeter wave (2-18 GHz). Dendrite like microstructures were achieved with the phase transformation from dendritic alpha-Fe2O3 to Fe3O4, Fe by partial and full reduction, and gamma-Fe2O3 by a reduction - oxidation process, while still preserving the dendritic morphology. The investigation of the magnetic properties and microwave absorbability reveals that the three hierarchical microstructures are typical ferromagnets and exhibit excellent microwave absorbability. In addition, this also confirms that the microwave absorption properties are ascribed to the dielectric loss for Fe and the combination of dielectric loss and magnetic loss for Fe3O4 and gamma-Fe2O3.
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