Mechanisms on the morphology variation of hematite crystals by Al substitution: The modification of Fe and O reticular densities
文献类型：期刊论文
| 作者 | Li, W; Liang, XL; An PF(安鹏飞); An, PF; Feng, XH; Tan, WF; Qiu, GH; Yin, H; Liu, F |
| 刊名 | SCIENTIFIC REPORTS
 |
| 出版日期 | 2016 |
| 卷号 | 6 |
| DOI | 10.1038/srep35960 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Al substitution in hematite is ubiquitous in soils. With the increase of Al amount, the hematite morphology changes from rhombohedral crystals to disk-shaped ones, but the underlying mechanism is poorly understood. Herein, a series of Al-substituted hematite were synthesized and characterized by synchrotron X-ray diffraction (SXRD), field emission scanning electron microscopy (FESEM), high resolution electron transmission microscopy (HRTEM) and extended X-ray absorption fine structure (EXAFS) spectroscopy, to investigate the effects of Al3+ substitution on the hematite structure and morphology. EXAFS and Rietveld structural refinement analyses find an increase in face-sharing (along c axis) Fe-Me (Me = Al, Fe) distances, edge-sharing (in a-b plane) Fe-Me (Me = Al, Fe) distances, and O-O average distances. Moreover, the face-sharing Fe-Me distances and O-O distances along c axis increase more significantly. This indicates a more apparent decrease in the reticular densities of Fe and O along the direction of c axis, which facilitates faster crystal growth along c axis and results in the evolution of morphology of Al-substituted hematite to disk-shaped crystals. The above results provide new insights into the morphology changes and environmental geochemistry behaviors of Al-contained hematite in soils, and are benefit for the control of crystal morphologies during its application as environmentally-friendly materials. |
| WOS关键词 | RAY-ABSORPTION SPECTROSCOPY ; ALUMINUM SUBSTITUTION ; SYNTHETIC HEMATITES ; IRON-OXIDES ; SURFACE RELAXATION ; MORIN TRANSITION ; FINE-STRUCTURE ; PARTICLE-SIZE ; ADSORPTION ; FERRIHYDRITE |
| 语种 | 英语 |
| WOS记录号 | WOS:000386766000001 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/260384]  |
| 专题 | 中国科学院高能物理研究所 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Li, W,Liang, XL,An PF,et al. Mechanisms on the morphology variation of hematite crystals by Al substitution: The modification of Fe and O reticular densities[J]. SCIENTIFIC REPORTS,2016,6. |
| APA | Li, W.,Liang, XL.,安鹏飞.,An, PF.,Feng, XH.,...&Liu, F.(2016).Mechanisms on the morphology variation of hematite crystals by Al substitution: The modification of Fe and O reticular densities.SCIENTIFIC REPORTS,6. |
| MLA | Li, W,et al."Mechanisms on the morphology variation of hematite crystals by Al substitution: The modification of Fe and O reticular densities".SCIENTIFIC REPORTS 6(2016). |
入库方式： OAI收割
来源：高能物理研究所
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