DOI: 10.1180/0009855023740062. Mössbauer spectra of α- and γ-polymorphs of FeOOH and Fe<sub>2</sub>O<sub>3</sub> : effects of poor crystallinity and of Al-for-Fe substitution

Mössbauer spectra of α- and γ-polymorphs of FeOOH and Fe2O3 : effects of poor crystallinity and of Al-for-Fe substitution

10.1180/0009855023740062

Crossref journal-article

Mineralogical Society

Clay Minerals (7149)

Abstract

AbstractThis paper presents various aspects, revealed by Mössbauer spectroscopy, of structural and magnetic properties of Al-substituted small-particle soil-related oxides. For goethite we focus on the relations between the hyperfine fields on the one hand, and crystallinity and Al content on the other. It is argued that these relations only provide a rough estimate of the Al content in natural samples. The ferrimagnetic-like behaviour reflected in the external-field Mössbauer spectra (4.2 K, 60 kOe) of certain Al goethites is presented. The spectra obtained for lepidocrocites are not spectacular, but confirmed that up to ∼10 at.% Al can be incorporated in the structure. Three differently-made series of hematites are considered. The Morin transition and spin structures in hematite are very sensitive to crystallinity and Al content, and probably to the presence of structural OH–. Integral low-energy electron Mössbauer spectroscopy on non-substituted samples indicates that the Morin-transition temperature in the surface layers (2 to 5 nm) is not significantly shifted from the bulk value. Measurements in extremely high magnetic fields (140 kOe) have shown that a spin-flip transition is induced in highly-substituted samples which exhibit no Morin transition in zero field. The use of external fields is crucial for the characterization and precise determination of the hyperfine parameters and site occupancies for maghemites, and for phase analyses of magnetic soils.

Bibliography

De Grave, E., Barrero, C. A., Da Costa, G. M., Vandenberghe, R. E., & Van San, E. (2002). MÃ¶ssbauer spectra of Î±- and Î³-polymorphs of FeOOH and Fe2O3â¯: effects of poor crystallinity and of Al-for-Fe substitution. Clay Minerals, 37(4), 591â606.

Authors 5

E. De Grave (first)
C. A. Barrero (additional)
G. M. Da Costa (additional)
R. E. Vandenberghe (additional)
E. Van San (additional)

References 64 Referenced 33

10.1023/A:1011076308501 / Hyperfi ne Interactions / Characterization of iron oxides commonly formed as cor rosi on product s on steel by Oh Sei (1998)
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Dates

Type	When
Created	21 years ago (Aug. 28, 2004, 3:27 a.m.)
Deposited	6 years, 3 months ago (May 6, 2019, 8:11 p.m.)
Indexed	2 months ago (June 28, 2025, 1:42 a.m.)
Issued	22 years, 8 months ago (Dec. 1, 2002)
Published	22 years, 8 months ago (Dec. 1, 2002)
Published Online	7 years, 1 month ago (July 9, 2018)
Published Print	22 years, 8 months ago (Dec. 1, 2002)

Funders 0

None

BibTeX

@article{De_Grave_2002, title={Mössbauer spectra of α- and γ-polymorphs of FeOOH and Fe2O3 : effects of poor crystallinity and of Al-for-Fe substitution}, volume={37}, ISSN={1471-8030}, url={http://dx.doi.org/10.1180/0009855023740062}, DOI={10.1180/0009855023740062}, number={4}, journal={Clay Minerals}, publisher={Mineralogical Society}, author={De Grave, E. and Barrero, C. A. and Da Costa, G. M. and Vandenberghe, R. E. and Van San, E.}, year={2002}, month=dec, pages={591–606} }

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