Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions
Cao, L; Jiang, ZX; Du, YH; Yin, XM; Xi, SB; Wen, W; Roberts, AP; Wee, ATS; Xiong, YM; Liu, QS; Gao, XY
2017
发表期刊ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
卷号51期号:5页码:2643-2651
文章类型期刊论文
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.
DOI10.1021/acs.est.6b04716
收录类别SCI
语种英语
WOS记录号WOS:000395963800020
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/27403
专题中科院上海应用物理研究所2011-2018年
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Cao, L,Jiang, ZX,Du, YH,et al. Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017,51(5):2643-2651.
APA Cao, L.,Jiang, ZX.,Du, YH.,Yin, XM.,Xi, SB.,...&Gao, XY.(2017).Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions.ENVIRONMENTAL SCIENCE & TECHNOLOGY,51(5),2643-2651.
MLA Cao, L,et al."Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions".ENVIRONMENTAL SCIENCE & TECHNOLOGY 51.5(2017):2643-2651.
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