Vacancy ordering in γ-Fe2O3 nanocrystals observed by 57Fe NMR

被引：29
|
作者：
Bastow, T. J. [1 ]
Trinchi, A. [1 ]
Hill, M. R. [1 ]
Harris, R. [1 ]
Muster, T. H. [1 ]
机构：
[1] CSIRO, Div Engn & Mat Sci, Clayton, Vic 3169, Australia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 17期
关键词：
Iron oxide; Maghemite; gamma-Fe2O3; Nanoparticle; Nanocrystal; Nuclear magnetic resonance; Solid-state NMR; X-ray diffraction; XRD; MAGNETITE;
D O I：
10.1016/j.jmmm.2009.03.064
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The identification by 57Fe internal field nuclear magnetic resonance (NMR) of hyperfine fields at four Fe sites in the (average) tetragonal unit cell of vacancy-ordered gamma-Fe2O3 (maghemite) is reported. The effects of vacancy redistribution due to annealing the partially vacancy-ordered form has been observed in the Fe-57 lineshape. In addition, the reduction of the particle size of the vacancy-ordered form has been observed to gradually eliminate the vacancy ordering and then to cause a transition from ferrimagnetism to superparamagnetism. Crown Copyright (c) 2009 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：2677 / 2681
页数：5
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