Growth of monodisperse nanospheres of MnFe_2O_4 with enhanced magnetic and optical properties
查看参考文献47篇
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文摘
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Highly dispersive nanospheres of MnFe_2O_4 are prepared by template free hydrothermal method. The nanospheres have 47.3-nm average diameter, narrow size distribution, and good crystallinity with average crystallite size about 22 nm. The reaction temperature strongly affects the morphology, and high temperature is found to be responsible for growth of uniform nanospheres. Raman spectroscopy reveals high purity of prepared nanospheres. High saturation magnetization (78.3 emu/g), low coercivity (45 Oe, 1 Oe=79.5775 A·cm~(-1)), low remanence (5.32 emu/g), and high anisotropy constant 2.84×10~4 J/m~3 (10 times larger than bulk) are observed at room temperatures. The nearly superparamagnetic behavior is due to comparable size of nanospheres with superparamagnetic critical diameter D_(cr)~(spm). The high value of K_(eff) may be due to coupling between the pinned moment in the amorphous shell and the magnetic moment in the core of the nanospheres. The nanospheres show prominent optical absorption in the visible region, and the indirect band gap is estimated to be 0.98 eV from the transmission spectrum. The prepared Mn ferrite has potential applications in biomedicine and photocatalysis. |
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来源
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Chinese Physics. B
,2013,22(10):107101-1-107101-7 【核心库】
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关键词
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Mn ferrite
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magnetic materials
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hydrothermal method
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superparamagnetic
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Raman spectroscopy
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地址
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1.
College of Science and Research Institute for New Energy, China Three Gorges University, Yichang, 443002
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Department of Physics, University of Science and Technology of Beijing, Beijing, 100083
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School of Material Science and Engineering, University of Science and Technology of Beijing, Beijing, 100083
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Research Center of Materials Science, Beijing Institute of Technology, Beijing, 100081
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1674-1056 |
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学科
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物理学 |
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基金
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国家自然科学基金
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the Beijing Natural Science Foundation (Preparation and Magnetic Properties of Ferromagnetic Nanoring Lattice)
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Research Foundation for Talented Scholars of China Three Gorges University. M. Y. Rafique was also supported by the Chancellor Scholarship of the University of Science and Technology of Beijing
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文献收藏号
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CSCD:4952351
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