Constraining the origins of the magnetism of lepidocrocite (γ-FeOOH): a Mössbauer and magnetisation study
Lepidocrocite, a widespread environmentally relevant iron oxyhydroxide, has been investigated for decades using 57Fe Mössbauer spectroscopy and magnetic measurements. However, a coherent and comprehensive interpretation of all the data is still lacking due to seemingly contradictory interpretations....
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| Format: | Article |
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Frontiers Media S.A.
2016-03-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | http://journal.frontiersin.org/Journal/10.3389/feart.2016.00028/full |
| _version_ | 1818433970248876032 |
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| author | Yohan eGuyodo Pierre eBonville Jessica L Till Jessica L Till Georges eOna-Nguema France eLagroix Nicolas eMenguy |
| author_facet | Yohan eGuyodo Pierre eBonville Jessica L Till Jessica L Till Georges eOna-Nguema France eLagroix Nicolas eMenguy |
| author_sort | Yohan eGuyodo |
| collection | DOAJ |
| description | Lepidocrocite, a widespread environmentally relevant iron oxyhydroxide, has been investigated for decades using 57Fe Mössbauer spectroscopy and magnetic measurements. However, a coherent and comprehensive interpretation of all the data is still lacking due to seemingly contradictory interpretations. On one hand, temperature dependence of magnetic susceptibility and Mössbauer spectra resemble those of superparamagnetic nanoparticles with diameters less than 10 nm even though physically particles are lath-shaped with lengths on the order of 100-300 nm. On the other hand, in-field Mössbauer spectra show that lepidocrocite is an antiferromagnet and becomes paramagnetic above 50-70 K, a temperature close to the blocking temperature deduced from susceptibility data. The present study investigates a well-characterized synthetic sample of lepidocrocite, includes modelling of Mössbauer spectra and dc and ac magnetization data, and proposes a solution to this paradox. The new data are coherent with the presence of two entities in lepidocrocite: a bulk antiferromagnetic matrix and sparse ferrimagnetic nanosized inclusions (d = 3.4 nm), akin to maghemite, embedded within. The presence of nanosized ferrimagnetic inclusions is confirmed for the first time by Mössbauer spectroscopy. |
| first_indexed | 2024-12-14T16:29:33Z |
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| id | doaj.art-b8b32cd026a34d2db58959b2bc21f5a6 |
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| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-14T16:29:33Z |
| publishDate | 2016-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-b8b32cd026a34d2db58959b2bc21f5a62022-12-21T22:54:37ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632016-03-01410.3389/feart.2016.00028184130Constraining the origins of the magnetism of lepidocrocite (γ-FeOOH): a Mössbauer and magnetisation studyYohan eGuyodo0Pierre eBonville1Jessica L Till2Jessica L Till3Georges eOna-Nguema4France eLagroix5Nicolas eMenguy6Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie, Sorbonne Universités - UPMC - CNRS UMR 7590 – MNHN - IRD UMR 206SPEC, CEA, CNRS, Université Paris-Saclay, CEA-SaclayInstitut de Minéralogie, de Physique des Matériaux, et de Cosmochimie, Sorbonne Universités - UPMC - CNRS UMR 7590 – MNHN - IRD UMR 206Deutsches GeoForschungsZentrum, TelegrafenbergInstitut de Minéralogie, de Physique des Matériaux, et de Cosmochimie, Sorbonne Universités - UPMC - CNRS UMR 7590 – MNHN - IRD UMR 206Institut de Physique du Globe de Paris, Sorbonne Paris Cité - UPD - CNRS UMR 7154Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie, Sorbonne Universités - UPMC - CNRS UMR 7590 – MNHN - IRD UMR 206Lepidocrocite, a widespread environmentally relevant iron oxyhydroxide, has been investigated for decades using 57Fe Mössbauer spectroscopy and magnetic measurements. However, a coherent and comprehensive interpretation of all the data is still lacking due to seemingly contradictory interpretations. On one hand, temperature dependence of magnetic susceptibility and Mössbauer spectra resemble those of superparamagnetic nanoparticles with diameters less than 10 nm even though physically particles are lath-shaped with lengths on the order of 100-300 nm. On the other hand, in-field Mössbauer spectra show that lepidocrocite is an antiferromagnet and becomes paramagnetic above 50-70 K, a temperature close to the blocking temperature deduced from susceptibility data. The present study investigates a well-characterized synthetic sample of lepidocrocite, includes modelling of Mössbauer spectra and dc and ac magnetization data, and proposes a solution to this paradox. The new data are coherent with the presence of two entities in lepidocrocite: a bulk antiferromagnetic matrix and sparse ferrimagnetic nanosized inclusions (d = 3.4 nm), akin to maghemite, embedded within. The presence of nanosized ferrimagnetic inclusions is confirmed for the first time by Mössbauer spectroscopy.http://journal.frontiersin.org/Journal/10.3389/feart.2016.00028/fullNanoparticlesLepidocrociteMössbauermagnetic propertiesiron oxyhydroxides |
| spellingShingle | Yohan eGuyodo Pierre eBonville Jessica L Till Jessica L Till Georges eOna-Nguema France eLagroix Nicolas eMenguy Constraining the origins of the magnetism of lepidocrocite (γ-FeOOH): a Mössbauer and magnetisation study Frontiers in Earth Science Nanoparticles Lepidocrocite Mössbauer magnetic properties iron oxyhydroxides |
| title | Constraining the origins of the magnetism of lepidocrocite (γ-FeOOH): a Mössbauer and magnetisation study |
| title_full | Constraining the origins of the magnetism of lepidocrocite (γ-FeOOH): a Mössbauer and magnetisation study |
| title_fullStr | Constraining the origins of the magnetism of lepidocrocite (γ-FeOOH): a Mössbauer and magnetisation study |
| title_full_unstemmed | Constraining the origins of the magnetism of lepidocrocite (γ-FeOOH): a Mössbauer and magnetisation study |
| title_short | Constraining the origins of the magnetism of lepidocrocite (γ-FeOOH): a Mössbauer and magnetisation study |
| title_sort | constraining the origins of the magnetism of lepidocrocite γ feooh a m 246 ssbauer and magnetisation study |
| topic | Nanoparticles Lepidocrocite Mössbauer magnetic properties iron oxyhydroxides |
| url | http://journal.frontiersin.org/Journal/10.3389/feart.2016.00028/full |
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