The influence of ruthenium on the magnetic properties of γ-Fe2O3 (maghemite) studied by Mossbauer spectroscopy

被引：0
|
作者：
Helgason, Ö
Greneche, JM
Berry, FJ
Mosselmans, F
机构：
[1] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland
[2] Univ Maine, LPEC, UMR 6087, F-72085 Le Mans 9, France
[3] Open Univ, Dept Chem, Milton Keynes MK7 6AA, Bucks, England
[4] CLRC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2003年 / 15卷 / 17期
关键词：
D O I：
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中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Ruthenium-doped gamma-Fe2O3 has been synthesized and examined by x-ray powder diffraction, XANES, EXAFS and by Fe-57 Mossbauer spectroscopy. Ruthenium K-edge x-ray absorption spectroscopy shows that ruthenium adopts a fully occupied octahedral site in the spinel related gamma-Fe2O3 structure as Ru4+. The Fe-57 Mossbauer spectra recorded in the presence of a longitudinal magnetic field of 6 T confirmed the octahedral coordination of the tetravalent ions and canting angles for the Fe3+ ions were determined as 24degrees for those in octahedral sites and 33degrees for those in tetrahedral sites. The Fe-57 Mossbauer spectra recorded in situ from ruthenium-doped gamma-Fe2O3 showed parameters typical of maghemite up to 600 K but with a magnetic hyperfine field distribution suggesting an inhomogeneous distribution of ruthenium within particles of varied size around about 15 nm. At 700 K a phase transition from gamma-Fe2O3 to alpha-Fe2O3 was observed and further studies showed the ruthenium-doped alpha-Fe2O3 to have a Morin transition temperature of about 400 K.
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页码：2907 / 2915
页数：9
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