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Structural and Magnetic Properties of Ferrihydrite

Published online by Cambridge University Press:  28 February 2024

Q. A. Pankhurst  and
R. J. Pollard
Q. A. Pankhurst
Affiliation:
Department of Physics, University of Liverpool, Liverpool L69 3BX, England
R. J. Pollard
Affiliation:
Department of Physics, University of Liverpool, Liverpool L69 3BX, England Department of Physics, Monash University, Clayton, Victoria 3168, Australia
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Abstract

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57Fe Mössbauer spectra of two synthetic samples of ferrihydrite, recorded at 4.2 K in applied fields of up to 9 T, have been analysed by a mean-field model. The samples exhibit two and six X-ray diffraction peaks. It is shown that only one ferric ion site is present in the mineral, and that in this site the ions are octahedrally coordinated. The spectra show the presence of different magnetic states: ferrimagnetism in two-line ferrihydrite, and antiferromagnetism in six-line ferrihydrite. The ferrimagnetism in two-line ferrihydrite is analysed in terms of random fluctuations arising from the small numbers of ferric ions per particle, and it is shown that the different magnetic states may arise purely as a result of these fluctuations.

Keywords

FerrihydriteFerrimagnetismAntiferromagnetism
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 3 , June 1992 , pp. 268 - 272
Copyright
Copyright © 1992, The Clay Minerals Society

References

Bigham, J. M., Schwertmann, U., Carlson, L. and Murad, E., A poorly crystallized oxyhydroxysulfate of iron formed by bacterial oxidation of Fe(II) in acid-mine waters Geochim. Cosmochim. Acta 1990 54 2743 – 2758 10.1016/0016-7037(90)90009-A.Google Scholar
Cardile, C. M., Tetrahedral Fe3+in ferrihydrite: 57Fe Mossbauer spectroscopic evidence Clays & Clay Minerals 1988 36 537 – 539 10.1346/CCMN.1988.0360607.Google Scholar
Chukhrov, F. V., Zvyagin, B. B., Ermilova, L. P., Gorshkov, A. I. and Serratosa, J. M., New data on iron oxides in the weathering zone Proc. Int. Clay Conf., Madrid, 1970 1973 Madrid Div. de Ciencias C.S.I.C. 333 – 341.Google Scholar
Coey, J M D and Readman, P. W., New spin structure in an amorphous ferric gel Nature 1973 246 476 – 478 10.1038/246476a0.Google Scholar
Eggleton, R. A. and Fitzpatrick, R. W., New data and a revised structural model for ferrihydrite Clays & Clay Minerals 1988 36 111 – 124 10.1346/CCMN.1988.0360203.Google Scholar
Eggleton, R. A. and Fitzpatrick, R. W., New data and a revised structural model for ferrihydrite: Reply Clays & Clay Minerals 1990 38 335 – 336 10.1346/CCMN.1990.0380315.CrossRefGoogle Scholar
Madsen, M. B., Morup, S. and Koch, C. J. W., Magnetic properties of ferrihydrite Hyperfine Interactions 1986 27 329 – 332 10.1007/BF02354773.CrossRefGoogle Scholar
Manceau, A., Combes, J.-M. and Calas, G., New data and a revised structural model for ferrihydrite: Comment Clays & Clay Minerals 1990 38 331 – 334 10.1346/CCMN.1990.0380314.Google Scholar
Murad, E., The Mossbauer spectrum of “well”-crystallised ferrihydrite J. Magn. Magn. Materials 1988 74 153 – 157 10.1016/0304-8853(88)90062-5.CrossRefGoogle Scholar
Murad, E., Bowen, L. H., Long, G. J. and Quin, T. G., The influence of crystallinity on magnetic ordering in natural ferrihydrites Clay Minerals 1988 23 161 – 173 10.1180/claymin.1988.023.2.04.Google Scholar
Pankhurst, Q. A., Anisotropy field measurement in barium ferrite powders by applied field Mossbauer spectroscopy J. Phys. Condens. Matter 1991 3 1323 – 1335 10.1088/0953-8984/3/10/010.CrossRefGoogle Scholar
Pankhurst, Q. A. and Pollard, R. J., Mossbauer spectra of antiferromagnetic powders in applied fields J. Phys. Condens. Matter 1990 2 7329 – 7337 10.1088/0953-8984/2/35/008.Google Scholar
Pollard, R. J. and Pankhurst, Q. A., Ferrimagnetism in fine feroxyhite particles J. Magn. Magn. Materials 1991 99 L39 – L44 10.1016/0304-8853(91)90045-C.Google Scholar
Pollard, R. J. and Pankhurst, Q. A., A comment on the detection of speromagnetism in insulators by Mössbauer Spectroscopy J. Phys. Condens. Matter 1992 4 L317 – L323 10.1088/0953-8984/4/21/003.Google Scholar
Pollard, R. J., Cardile, C. M., Lewis, D. G. and Brown, L. J., Characterization of FeOOH polymorphs and ferrihydrite using low-temperature, applied-field, Mössbauer spectroscopy Clay Miner. 1992 27 57 – 71 10.1180/claymin.1992.027.1.06.CrossRefGoogle Scholar
Pollard, R. J. Pankhurst, Q. A. and Zientek, P., Magnetism in aluminous goethite Phys. Chem. Miner. 1991 18 259 – 264 10.1007/BF00202578.Google Scholar
Towe, K. M. and Bradley, W. F., Mineralogical constitution of colloidal “hydrous ferric oxides” J. Colloid Interface Sci. 1967 24 384 – 392 10.1016/0021-9797(67)90266-4.Google Scholar