Effects of crystallite size on the structure and magnetism of ferrihydrite

doi:10.1039/c5en00191a

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Effects of crystallite size on the structure and magnetism of ferrihydrite
	Wang, Xiaoming 1,2; Zhu, Mengqiang 2; Koopal, Luuk K.3; Li, Wei 4; Xu, Wenqian 5; Liu, Fan 1; Zhang, Jing 6; Liu, Qingsong 7,8; Feng, Xionghan 1; Sparks, Donald L.9,10
刊名	ENVIRONMENTAL SCIENCE-NANO
	2016
卷号	3 期号:1 页码:190-202
DOI	10.1039/c5en00191a
文献子类	Article
英文摘要	The structure and magnetic properties of nano-sized (1.6 to 4.4 nm) ferrihydrite samples are systematically investigated through a combination of X-ray diffraction (XRD), X-ray pair distribution function (PDF), X-ray absorption spectroscopy (XAS) and magnetic analyses. The XRD, PDF and Fe K-edge XAS data of the ferrihydrite samples are all fitted well with the Michel ferrihydrite model, indicating similar local-, mediumand long-range ordered structures. PDF and XAS fitting results indicate that, with increasing crystallite size, the average coordination numbers of Fe-Fe and the unit cell parameter c increase, while Fe2 and Fe3 vacancies and the unit cell parameter a decrease. Mossbauer results indicate that the surface layer is relatively disordered, which might have been caused by the random distribution of Fe vacancies. These results support Hiemstra's surface-depletion model in terms of the location of disorder and the variations of Fe2 and Fe3 occupancies with size. Magnetic data indicate that the ferrihydrite samples show antiferromagnetism superimposed with a ferromagnetic-like moment at lower temperatures (100 K and 10 K), but ferrihydrite is paramagnetic at room temperature. In addition, both the magnetization and coercivity decrease with increasing ferrihydrite crystallite size due to strong surface effects in fine-grained ferrihydrites. Smaller ferrihydrite samples show less magnetic hyperfine splitting and a lower unblocking temperature (TB) than larger samples. The dependence of magnetic properties on grain size for nano-sized ferrihydrite provides a practical way to determine the crystallite size of ferrihydrite quantitatively in natural environments or artificial systems.
WOS关键词	RAY-ABSORPTION SPECTROSCOPY ; SYNTHETIC 6-LINE FERRIHYDRITE ; 2-LINE FERRIHYDRITE ; ELECTRON NANODIFFRACTION ; NANOCRYSTALLINE MATERIAL ; OXIDE NANOPARTICLES ; IRON OXYHYDROXIDE ; SURFACE-STRUCTURE ; MODEL ; MOSSBAUER
WOS研究方向	Chemistry ; Environmental Sciences & Ecology ; Science & Technology - Other Topics
语种	英语
WOS记录号	WOS:000374699800018
资助机构	National Natural Science Foundation of China (NSFC)(41471194 ; National Natural Science Foundation of China (NSFC)(41471194 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB15020402) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB15020402) ; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences(DE-AC02-98CH10886) ; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences(DE-AC02-98CH10886) ; 41571448) ; 41571448) ; National Natural Science Foundation of China (NSFC)(41471194 ; National Natural Science Foundation of China (NSFC)(41471194 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB15020402) ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB15020402) ; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences(DE-AC02-98CH10886) ; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences(DE-AC02-98CH10886) ; 41571448) ; 41571448)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53484]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Huazhong Agr Univ, Coll Resources & Environm, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, Wuhan 430070, Peoples R China 2.Univ Wyoming, Dept Ecosyst Sci & Management, Laramie, WY 82071 USA 3.Wageningen Univ, Phys Chem & Soft Matter, Dreijenpl 6, NL-6703 HB Wageningen, Netherlands 4.Nanjing Univ, Sch Earth Sci & Engn, Minist Educ, Key Lab Surficial Geochem, Nanjing 210093, Jiangsu, Peoples R China 5.Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA 6.Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100039, Peoples R China 7.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 8.Natl Oceanog Lab, Funct Lab Marine Geol, Qingdao 266061, Peoples R China 9.Univ Delaware, Delaware Environm Inst, Environm Soil Chem Grp, Newark, DE 19716 USA 10.Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19716 USA
推荐引用方式 GB/T 7714	Wang, Xiaoming,Zhu, Mengqiang,Koopal, Luuk K.,et al. Effects of crystallite size on the structure and magnetism of ferrihydrite[J]. ENVIRONMENTAL SCIENCE-NANO,2016,3(1):190-202.
APA	Wang, Xiaoming.,Zhu, Mengqiang.,Koopal, Luuk K..,Li, Wei.,Xu, Wenqian.,...&Sparks, Donald L..(2016).Effects of crystallite size on the structure and magnetism of ferrihydrite.ENVIRONMENTAL SCIENCE-NANO,3(1),190-202.
MLA	Wang, Xiaoming,et al."Effects of crystallite size on the structure and magnetism of ferrihydrite".ENVIRONMENTAL SCIENCE-NANO 3.1(2016):190-202.