Berry, Frank; Helgason, O. and Mosselmans, J.W.F.
(2004).
Iron-57 Mossbauer spectroscopic investigation of manganese-doped gamma-Fe2O3.
Hyperfine Interactions, 156(1),
pp. 305–309.
Abstract
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.
| Item Type: |
Journal Article
|
| ISSN: |
0304-3843 |
| Extra Information: |
Some of the symbols may not have transferred correctly into this bibliographic record and/or abstract. |
| Keywords: |
Manganese-doped γ -Fe2O3; Mössbauer spectroscopy |
| Academic Unit/Department: |
Science > Life, Health and Chemical Sciences |
| Item ID: |
5746 |
| Depositing User: |
David Shuker
|
| Date Deposited: |
09 Nov 2006 |
| Last Modified: |
02 Dec 2010 19:54 |
| URI: |
http://oro.open.ac.uk/id/eprint/5746 |
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