The structure of six-line ferrihydrite

被引：92
作者：
Jansen, E [1 ]
Kyek, A
Schäfer, W
Schwertmann, U
机构：
[1] Univ Bonn, KFA Julich GmbH, Forschungszentrum, Mineral Petrol Inst, D-52425 Julich, Germany
[2] Tech Univ Munich, Phys Dept E15, D-85747 Garching, Germany
[3] Tech Univ Munich, Lehrstuhl Bodenkunde, D-85350 Freising Weihenstephan, Germany
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2002年 / 74卷 / Suppl 1期
关键词：
PACS: 61.12.Ld; 75.50.Ee;
D O I：
10.1007/s003390101175
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nanocrystalline ferrihydrite (bulk formula 5Fe(2)O(3) (.) 9H(2)O) synthesized by hydrolysis of Fe(III) nitrate at 348 K was investigated by neutron diffraction at 5, 293 and 323 K. The structure is refined as a sum of a defect-free phase (space group P31c) and a defective phase (space group P3) based on earlier discussed models from X-ray diffraction results on a six-line ferrihydrite. The size of the nanoparticles was found to be 2.7 (0.8) nm. The material reveals antiferromagnetic order below T-N = 330(20) K with collinear Fe spins (sequence + - + -) perpendicular to the trigonal axis. The ordered moment is 3.2 mu(B)/Fe at 5 K.
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收藏
页码：S1004 / S1006
页数：3
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