Iron-57 Mossbauer spectroscopic investigation of manganese-doped γ-Fe2O3

被引：0
作者：
Berry, FJ
Helgason, Ö
Mosselmans, JWF
机构：
[1] Open Univ, Dept Chem, Milton Keynes MK7 6AA, Bucks, England
[2] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland
[3] SERC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England
来源：
HYPERFINE INTERACTIONS | 2004年 / 156卷 / 01期
关键词：
manganese-doped gamma-Fe2O3; Mossbauer spectroscopy;
D O I：
10.1023/B:HYPE.0000043245.49415.4f
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
Manganese-doped gamma-Fe2O3 has been prepared by precipitation techniques and shown by Mn K-edge XANES and EXAFS to contain Mn3+ in the octahedral sites of the spinel-related structure. The Fe-57 Mossbauer spectra recorded in situ between 295 and 750 K show that conversion of the spinel-related gamma-Fe2O3 -to the corundum-related alpha-Fe2O3-structure occurs at ca. 700 and 730 K in the samples containing ca. 1.5 and 4.1% manganese, respectively. The presence of manganese therefore stabilises the gamma-Fe2O3-related structure relative to conversion to the alpha-Fe2O3 phase. The temperature dependence of the spectra recorded from the manganese-doped alpha-Fe2O3 is similar to that of pure alpha-Fe2O3 but with a smaller hyperfine magnetic field reflecting the presence of the manganese dopant.
引用
收藏
页码：305 / 309
页数：5
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