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

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.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1023/B:HYPE.0000043245.49415.4f
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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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