The effect of water content on the magnetic and structural properties of goethite

被引:26
作者
Betancur, JD [1 ]
Barrero, CA
Greneche, JM
Goya, GF
机构
[1] Univ Antioquia, Inst Fis, Grp Estado Solido, AA-1226 Medellin, Colombia
[2] Univ Maine, CNRS, UMR 6087, Lab Phys Etat Condense, F-72085 Le Mans 9, France
[3] Univ Sao Paulo, Inst Fis, Lab Mat Magnet, BR-01498 Sao Paulo, Brazil
关键词
goethite; water content; Mossbauer spectrometry; magnetic properties; crystallinity;
D O I
10.1016/j.jallcom.2003.09.046
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We have studied the effect of water content on the magnetic and structural properties of goethite. For that purpose, four samples were prepared using two different hydrothermal methods, one of them is derived on the Fe(11) precursors and the other one from Fe(III) precursors. The samples were characterized by X-ray diffraction (XRD), TGA, BET, FTIR, Mossbatter spectrometry at RT, 77 and 4.2 K and ZFC and FC curves. The results suggest that the goethites from the Fe(II) precursors are less crystalline, have higher water contents and do not show magnetic ordered structure at RT in comparison to the goethites froth the Fe(Ill) precursors. The goethites from the last systems exhibit good crvstallinity. low water content and magnetic ordering at room temperature. Our results suggest that both structural and adsorbed water contents reduce the magnetic hyperfine field at 4.2 K. A linear correlation with regression coefficient of 0.91 between the saturation hyperfine field and both the structural hydroxyl content and the surface area could be derived. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:247 / 251
页数:5
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