DOI: 10.1180/claymin.1993.028.2.02. Structural Model for Ferrihydrite

10.1180/claymin.1993.028.2.02

Crossref journal-article

Mineralogical Society

Clay Minerals (7149)

Abstract

AbstractThe structure of 6-line and 2-line ferrihydrite (Fh) has been reconsidered. X-ray diffraction (XRD) curves were first simulated for the different structural models so far proposed, and it is shown that neither of these corresponds to the actual structure of ferrihydrite. On the basis of agreement between experimental and simulated XRD curves it is shown that Fh is a mixture of three components: (i) Defect-free Fh consisting of anionic ABACA . . . close packing in which Fe atoms occupy only octahedral sites with 50% probability; the hexagonal unit-cell parameters are a = 2-96 Å and c = 9-40 Å, and the space group is P1c. (ii) Defective Fh in which Ac1Bc2A and Ab1Cb2A structural fragments occur with equal probability and alternate completely at random; Fe atoms within each of these fragments have identical ordered distribution with in the hexagonal super-cell with a = 5.26 Å. (iii) Ultradispersed hematite with mean dimension of coherent scattering domains (CSD) of 10-20 Å. The main structural difference between 6-line and 2-line Fh is the size of their CSD which is extremely small for the latter structure. Nearest Fe-Fe distances calculated for this new structural model are very close to those determined by EXAFS spectroscopy on the same samples.

Bibliography

Drits, V. A., Sakharov, B. A., Salyn, A. L., & Manceau, A. (1993). Structural Model for Ferrihydrite. Clay Minerals, 28(2), 185â207.

Authors 4

V. A. Drits (first)
B. A. Sakharov (additional)
A. L. Salyn (additional)
A. Manceau (additional)

References 29 Referenced 289

10.1346/CCMN.1983.0310405
10.1346/CCMN.1988.0360203
10.1007/978-3-642-50031-2
10.1016/0016-7061(73)90066-9
10.1007/978-94-009-4007-9_11
10.1080/02603598408078138
10.1021/ja00220a008
10.1346/CCMN.1990.0380314
10.1180/claymin.1979.014.2.03
10.1038/2161188a0
{'key': 'S0009855800026303_ref021', 'first-page': '339', 'article-title': 'X-ray diffraction by mixed-layer structures with random distribution of stacking faults', 'volume': '265', 'author': 'Sakharov', 'year': '1982a', 'journal-title': 'Doki. Akad. Nauk. SSSR,'} / Doki. Akad. Nauk. SSSR, / X-ray diffraction by mixed-layer structures with random distribution of stacking faults by Sakharov (1982a)
{'key': 'S0009855800026303_ref005', 'first-page': '23', 'article-title': 'Ferrihydrite', 'volume': '4', 'author': 'Chukhrov', 'year': '1973', 'journal-title': 'Izvestiya Akad. Nauk. SSR, Ser. Geol.'} / Izvestiya Akad. Nauk. SSR, Ser. Geol. / Ferrihydrite by Chukhrov (1973)
10.1016/0016-7037(81)90250-7
{'key': 'S0009855800026303_ref001', 'first-page': '123', 'article-title': 'Refinement of the hematite structure.', 'volume': '51', 'author': 'Blake', 'year': '1966', 'journal-title': 'Am. Miner.'} / Am. Miner. / Refinement of the hematite structure. by Blake (1966)
{'key': 'S0009855800026303_ref007', 'volume-title': 'X-ray Diffraction of Disordered Lamellar Structures. Theory and Application to Microdivided Silicates and Carbons.', 'author': 'Drits', 'year': '1990'} / X-ray Diffraction of Disordered Lamellar Structures. Theory and Application to Microdivided Silicates and Carbons. by Drits (1990)
10.1180/claymin.1993.028.2.01
10.1002/hlca.19730560820
10.1180/claymin.1993.028.2.03
10.1346/CCMN.1990.0380315
10.1016/0021-9797(67)90266-4
10.1346/CCMN.1972.0200306
{'key': 'S0009855800026303_ref013', 'first-page': '212', 'article-title': "Magnetic properties of synthetic feroxyhite (δ'-FeOOH)", 'author': 'Koch', 'year': '1987', 'journal-title': 'Proc. Int. Clay Conf. Denver,'} / Proc. Int. Clay Conf. Denver, / Magnetic properties of synthetic feroxyhite (δ'-FeOOH) by Koch (1987)
10.1016/0021-9797(76)90256-3
10.1107/S0021889881009424
{'key': 'S0009855800026303_ref022', 'first-page': '871', 'article-title': 'X-ray intensities scattered by layer defective structures with short range ordering factors S>1 and G>1.', 'volume': '265', 'author': 'Sakharov', 'year': '1982b', 'journal-title': 'Dokl. Akad. Nauk. SSSR,'} / Dokl. Akad. Nauk. SSSR, / X-ray intensities scattered by layer defective structures with short range ordering factors S>1 and G>1. by Sakharov (1982b)
10.1346/CCMN.1989.0370302
{'key': 'S0009855800026303_ref006', 'volume-title': 'X-ray Structural Analysis of Mixed-layer Minerals.', 'author': 'Drits', 'year': '1976'} / X-ray Structural Analysis of Mixed-layer Minerals. by Drits (1976)
{'key': 'S0009855800026303_ref003', 'volume-title': 'Crystal Structures of Clay Minerals and their X-ray Identification', 'author': 'Brown', 'year': '1980'} / Crystal Structures of Clay Minerals and their X-ray Identification by Brown (1980)
10.1016/0001-8686(89)80009-0

Dates

Type	When
Created	18 years, 9 months ago (Nov. 13, 2006, 4:05 p.m.)
Deposited	6 years, 3 months ago (May 15, 2019, 2:49 p.m.)
Indexed	3 weeks, 2 days ago (July 30, 2025, 11:10 a.m.)
Issued	32 years, 2 months ago (June 1, 1993)
Published	32 years, 2 months ago (June 1, 1993)
Published Online	7 years, 1 month ago (July 9, 2018)
Published Print	32 years, 2 months ago (June 1, 1993)

Funders 0

None

BibTeX

@article{Drits_1993, title={Structural Model for Ferrihydrite}, volume={28}, ISSN={1471-8030}, url={http://dx.doi.org/10.1180/claymin.1993.028.2.02}, DOI={10.1180/claymin.1993.028.2.02}, number={2}, journal={Clay Minerals}, publisher={Mineralogical Society}, author={Drits, V. A. and Sakharov, B. A. and Salyn, A. L. and Manceau, A.}, year={1993}, month=jun, pages={185–207} }

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