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题名:
Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions
作者: Cao, L; Jiang, ZX; Du, YH; Yin, XM; Xi, SB; Wen, W; Roberts, AP; Wee, ATS; Xiong, YM; Liu, QS; Gao, XY
刊名: ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期: 2017
卷号: 51, 期号:5, 页码:2643-2651
DOI: 10.1021/acs.est.6b04716
文章类型: 期刊论文
英文摘要: As an iron oxyhydroxide, nanosized ferrihydrite (Fh) is important in Earth science, biology, and industrial applications. However, its basic structure and origin of its magnetism have long been debated. We integrate synchrotron-based techniques to explore the chemical structures of 2-line ferrihydrite and to determine the origin of its magnetism during hydrothermal aging in air. Our results demonstrate that both the magnetism and X-ray magnetic circular dichroism (XMCD) signal of 2-line ferrihydrite are enhanced with aging time, and that XMCD spectral patterns resemble that of maghemite (gamma-Fe2O3) rather than magnetite (Fe3O4). Fe L-edge and K-edge X-ray absorption spectroscopy (XAS) further indicate formation of both maghemite and hematite (alpha-Fe2O3) with increasing concentrations with longer hydrothermal aging time. Thus, magnetic enhancement with longer hydrothermal aging time is attributed to increasing maghemite concentration instead of a magnetically ordered ferrihydrite as previously reported. Moreover, L-edge and K-edge XAS spectra with different probing depths yield different ratios of these Fe oxides, which suggest the formation of a core (ferrihydrite-rich)-shell (with a mixture of both allotropes; alpha-Fe2O3 and gamma-Fe2O3) structure during hydrothermal aging. Our results provide insights into the chemical evolution of 2-line ferrihydrite that reveal unambiguously the origin of its magnetism.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000395963800020
ISSN号: 0013-936X
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/27403
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Cao, L,Jiang, ZX,Du, YH,et al. Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017-01-01,51(5):2643-2651.
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文件名: Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions.pdf
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