57Fe Mössbauer effect study of Mn-substituted goethite and hematite |
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| Authors: | R. E. Vandenberghe A. E. Verbeeck E. De Grave W. Stiers |
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| Affiliation: | (1) Laboratorium voor Magnetisme, Rijksuniversiteit Gent Proeftuinstraat86, B-9000 Gent, Belgium;(2) Present address: Research Associate of the National Fund for Scientific Research, (Belgium);(3) Present address: Laboratorium voor Geomorfologie en Sedimentologie, Katholieke Universiteit Leuven, (Belgium) |
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| Abstract: | 57Fe Mössbauer spectroscopy is performed on synthetic Mn-substituted goethites, α-(Fe1?cMnc)OOH, and hematites, α-(Fe1?cMnc)2O3, with c up to 0.08. The hyperfine parameters and in particular the magnetic hyperfine field are found to be less influenced by Mn substitution than in the case of Al. On the other hand, Mn substitution suppresses drastically the Morin transition in hematite which results in a weakly-ferromagnetic state at 80K for compositions with c>0.04. |
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