Mineralogy of greigite Fe3S4

被引：23
|
作者：
Letard, I. [1 ]
Sainctavit, Ph. [1 ]
Menguy, N. [1 ]
Valet, J. -P. [2 ]
Isambert, A. [2 ]
Dekkers, M. [3 ]
Gloter, A. [4 ]
机构：
[1] Univ Paris 06, Lab Mineral Cristallog Paris, F-75252 Paris 05, France
[2] Inst Phys Globe, Paris, France
[3] Univ Utrecht, Paleomagnet Lab, NL-3508 TC Utrecht, Netherlands
[4] Univ Paris 11, Phys Solides Lab, F-91405 Orsay, France
来源：
PHYSICA SCRIPTA | 2005年 / T115卷
关键词：
D O I：
10.1238/Physica.Topical.115a00489
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Greigite Fe3S4 is one of the two natural magnetic iron sulphides. Its formula and structure make it the sulphide equivalent of magnetite Fe3O4, leading to frequent confusions between these two spinelles in paleomagnetic studies and possible wrong interpretation of some paleaomagnetization measurements. We have carried out high resolution EELS experiments and recorded X-ray magnetic circular dichroic spectra at the iron L-2,L-3 edges on natural and synthetic samples. The natural samples present a core-shell structure of crystallized greigite surrounded by an amorphous iron oxide phase. The differences observed on the XMCD signal of Fe3S4 compared to Fe3O4 could be explained by the presence of iron vacancies, Fe3S4 being a lacunary iron sulphide.
引用
收藏
页码：489 / 491
页数：3
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