Influence of zinc doping on the structural and magnetic properties of α-Fe2O3

被引：29
作者：
Ayub, I
Berry, FJ
Bilsborrow, RL
Helgason, Ö
Mercader, RC
Moore, EA
Stewart, SJ
Wynn, PG
机构：
[1] Open Univ, Dept Chem, Milton Keynes MK7 6AA, Bucks, England
[2] Natl Univ La Plata, Dept Fis, RA-1900 La Plata, Argentina
[3] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland
[4] Daresbury Lab, Warrington WA4 4AD, Cheshire, England
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2001年 / 156卷 / 02期
关键词：
D O I：
10.1006/jssc.2000.9014
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Zinc-doped alpha -Fe2O3 has been prepared by hydrothermal methods. The zinc K-edge EXAFS and interatomic potential calculations indicate that Zn2+ ions substitute for Fe3+ ions in the lattice and are accompanied by oxygen vacancies. The Fe-57 Mossbauer spectra recorded between 296 and 18 K demonstrate that the Morin transition in alpha -Fe2O3 is completely suppressed within this temperature range by the presence of zinc. The 57Fe Mossbauer spectra recorded in situ at temperatures between 300 and 915 K show the material to undergo conversion to the spinel-related ZnFe2O4 phase in this temperature regime. The results demonstrate that the structural and magnetic properties of zinc-doped alpha -Fe2O3 and its behavior at elevated temperatures are different from those of magnesium-doped alpha -Fe2O3. (C) 2001 Academic Press.
引用
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页码：408 / 414
页数：7
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