Berry, Frank; Helgason, O. and Mosselmans, J.W.F.
|DOI (Digital Object Identifier) Link:||http://doi.org/10.1023/B:HYPE.0000043245.49415.4f|
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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|
|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:||Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
|Depositing User:||David Shuker|
|Date Deposited:||09 Nov 2006|
|Last Modified:||04 Oct 2016 09:56|
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