Su W N, Wu X L, Wang X, Zhang Y Y, Shen J C, Zhu J M
National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, PR China.
J Nanosci Nanotechnol. 2011 Dec;11(12):10963-6. doi: 10.1166/jnn.2011.4067.
In this paper, we report the synthesis of crystalline beta-FeSi2 via the reaction of Si and Fe powders under high-temperature and high-pressure. X-ray diffraction and Raman scattering results confirm formation of the beta-FeSi2 phase. Scanning electron microscopy, high-resolution transmission electron microscopy, and selected-area electron diffraction patterns show that the beta-FeSi2 phase coexists with Si phase with small nanocrystal sizes. The formation of the beta-FeSi2 phase is a result of Si diffusion into Fe region. The obtained results suggest that the removal of Si phase can be reached through increasing Fe content and prolonging the duration of high-pressure thermal treatment.
在本文中，我们报道了通过高温高压下硅粉与铁粉的反应合成晶体β-FeSi₂。X射线衍射和拉曼散射结果证实了β-FeSi₂相的形成。扫描电子显微镜、高分辨率透射电子显微镜和选区电子衍射图表明，β-FeSi₂相与尺寸较小的纳米晶体硅相共存。β-FeSi₂相的形成是硅扩散到铁区域的结果。所得结果表明，通过增加铁含量和延长高压热处理时间可以实现硅相的去除。
