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：

暂无

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.

引用

页码：2907 / 2915

页数：9

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