Magnetic properties of synthetic six-line ferrihydrite nanoparticles

被引:96
作者
Guyodo, Y
Banerjee, SK
Penn, RL
Burleson, D
Berquo, TS
Seda, T
Solheid, P
机构
[1] Lab Sci Climat & Environm, F-91198 Gif Sur Yvette, France
[2] Univ Minnesota, Dept Geol & Geophys, Inst Rock Magnetism, Minneapolis, MN 55455 USA
[3] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA
[4] Western Washington Univ, Dept Phys & Astron, Bellingham, WA 98225 USA
基金
美国国家科学基金会;
关键词
rock magnetism; ferrihydrite; magnetic properties; EXAFS; Mossbauer effect;
D O I
10.1016/j.pepi.2005.05.009
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Three synthetic samples of six-line ferrihydrite (Fh5.4, Fh4.1, and Fh3.0), with average particle sizes of 5.4, 4.1, and 3.0 nm (respectively), have been studied by low-temperature magnetic techniques, Mossbauer spectroscopy, transmission electron microscopy, and X-ray absorption spectroscopy. Magnetic data indicate that these nanoparticles are not only antiferromagnetic, but that they also possess a ferromagnetic-like moment due to the presence of uncompensated spins. Both magnetic and Mossbauer data indicate that nanoparticles of six-line ferrihydrite are superparamagnetic at room temperature, with a low-temperature transition between blocked and unblocked magnetic states dependent on average particle size. In particular, low-field magnetic susceptibility data display a peak in amplitude at 45 K (Fh3.0), 55 K (Fh4.1), and 80 K (Fh5.4). Low-temperature induced magnetization data, acquired in magnetic fields up to 5 T, also display clearly a superparamagnetic behavior. These data were tentatively modeled as the sum of two contributions: a linear term due to the antiferromagnetic susceptibility and a nonlinear term due to the uncompensated spins. Model estimates of the magnetization carried by the uncompensated spins (M-nc) show a decrease in M-nc with increasing temperature. Extrapolation of M-nc values down to zero provided an estimate of the Neel temperature for six-line ferrihydrite on the order of 500 K. (c) 2006 Elsevier B.V. All fights reserved.
引用
收藏
页码:222 / 233
页数:12
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