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Mechanisms on the morphology variation of hematite crystals by Al substitution: The modification of Fe and O reticular densities
Li, W; Liang, XL; An PF(安鹏飞); An, PF; Feng, XH; Tan, WF; Qiu, GH; Yin, H; Liu, F
2016
发表期刊SCIENTIFIC REPORTS
卷号6
文章类型期刊论文
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.
DOI10.1038/srep35960
关键词[WOS]RAY-ABSORPTION SPECTROSCOPY ; ALUMINUM SUBSTITUTION ; SYNTHETIC HEMATITES ; IRON-OXIDES ; SURFACE RELAXATION ; MORIN TRANSITION ; FINE-STRUCTURE ; PARTICLE-SIZE ; ADSORPTION ; FERRIHYDRITE
语种英语
WOS类目Multidisciplinary Sciences
WOS记录号WOS:000386766000001
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260384
专题多学科研究中心
作者单位中国科学院高能物理研究所
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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).
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