| 光谱学与光谱分析 |
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| Preparation, Characterization and Property of Bamboo-Like α-Fe2O3 Nanobars |
| CHEN Chuan-sheng1, 2, LIU Yong1, HUANG Bai-yun1, LEI Ting1, CHEN Xiao-hua2 |
1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
2. College of Physics and Eelectronics Science, Changsha University of Science and Technology, Changsha 410076, China |
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Abstract Firstly, hydroxide iron precursor was prepared by the co-precipitation method through using nitric iron as the source of iron, ammonia as precipitants, and poly-glycol as dispersant. Secondly, the precursor was calcined at 450 ℃ for 2 h under the protection of nitrogen. Finally, the images and structures of resultant powders were investigated by transmission electron microscopes (TEM), X-ray diffraction (XRD), Raman spectrum and the near-edge X-ray absorption fine structure (NEXAFS), respectively, and the magnetic property of resultant powders was measured by a vibrating sample magnetometer (VSM HH-50). The experimental results of TEM show that the products are composed of Fe2O3 nano-particles with sizes in the range of 50-100 nm and bamboo-like Fe2O3 nanobars about 10 nm in diameter. The experimental results of XRD and spectrum illuminate that the structures of products are α-Fe2O3. Moreover, magnetic properties measurement reveals that the products exhibit typical magnetic hysteresis loops of ferromagnetism materials, and their saturation magnetization and coercive force are approximately 64.65 emu·g-1 and 15.13 Oe, respectively.
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Received: 2008-03-29
Accepted: 2008-06-30
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Corresponding Authors:
CHEN Chuan-sheng
E-mail: jxccs1934@yahoo.com.cn
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