Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions

doi:10.1021/acs.est.6b04716

CAS OpenIR > 中科院上海应用物理研究所2011-2018年

	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
ISSN	0013-936X
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.
DOI	10.1021/acs.est.6b04716
收录类别	SCI
语种	英语
WOS记录号	WOS:000395963800020
引用统计
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
推荐引用方式 GB/T 7714	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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