DOI: 10.1346/ccmn.1982.0300506. Oxidation and Reduction of Structural Iron in Chlorite at 480°C

Oxidation and Reduction of Structural Iron in Chlorite at 480°C

10.1346/ccmn.1982.0300506

Crossref journal-article

Cambridge University Press (CUP)

Clays and Clay Minerals (56)

Abstract

AbstractAn iron-rich chlorite, ripidolite, was oxidized by air-heating at 480°C, i.e., below the dehydroxylation temperature and subsequently reduced in hydrogen at the same temperature. On the basis of chemical, differential thermal, infrared, Mössbauer, and X-ray powder diffraction analyses, Fe(II) seems to be present only in the 2:1 layer of the original chlorite in a type of site similar to that of Fe(II) in biotite, with OH in cis-positions. These data also suggest that octahedral Al and Fe(III) are located in the hydroxide sheet of the original chlorite. The structural changes of the mineral due to the oxidation and the subsequent reduction appear limited to minor structural rearrangements and, perhaps, to the introduction of OH in both cis- and trans-positions. The results of the investigation are in agreement with a reaction of the form: [Fe(II)OH]+ ⇋ [Fe(III)O]+ + H(H+ + e−).

Bibliography

Borggaard, O. K., Lindgreen, H. B., & MÃ¸rup, S. (1982). Oxidation and Reduction of Structural Iron in Chlorite at 480Â°C. Clays and Clay Minerals, 30(5), 353â363.

Authors 3

Ole K. Borggaard (first)
Holger B. Lindgreen (additional)
Steen Mørup (additional)

References 35 Referenced 41

{'key': 'S0009860400010314_CR4', 'first-page': '86', 'volume-title': 'Crystal Structures of Clay Minerals and their X-ray Identification', 'author': 'Bailey', 'year': '1980'} / Crystal Structures of Clay Minerals and their X-ray Identification by Bailey (1980)
{'key': 'S0009860400010314_CR9', 'first-page': '207', 'volume-title': 'The Differential Thermal Investigation of Clays', 'author': 'Caillère', 'year': '1957'} / The Differential Thermal Investigation of Clays by Caillère (1957)
10.1111/j.1365-2389.1979.tb01022.x
10.1180/minmag.1971.038.294.01
10.1346/CCMN.1976.0240601
{'key': 'S0009860400010314_CR17', 'first-page': '1206', 'article-title': 'Si-O absorption band near 1000 cm−1 and OH absorption bands of chlorite', 'volume': '52', 'author': 'Hayashi', 'year': '1967', 'journal-title': 'Amer. Mineral.'} / Amer. Mineral. / Si-O absorption band near 1000 cm−1 and OH absorption bands of chlorite by Hayashi (1967)
10.1111/j.1365-2389.1976.tb02017.x
10.1016/0022-1902(78)80037-2
10.1021/ac60267a017
10.1346/CCMN.1974.0220405
{'key': 'S0009860400010314_CR18', 'first-page': '507', 'article-title': 'Mössbauer spectra of chlorites in natural and heated state', 'volume': '10', 'author': 'Hayashi', 'year': '1972', 'journal-title': 'Kobutsugaku Zassh.'} / Kobutsugaku Zassh. / Mössbauer spectra of chlorites in natural and heated state by Hayashi (1972)
10.3406/argil.1972.1167
{'key': 'S0009860400010314_CR16', 'first-page': '476', 'article-title': 'Relationship between infrared absorption spectra in the region of 450–900 cm−1 and chemical composition of chlorite', 'volume': '50', 'author': 'Hayashi', 'year': '1965', 'journal-title': 'Amer. Mineral.'} / Amer. Mineral. / Relationship between infrared absorption spectra in the region of 450–900 cm−1 and chemical composition of chlorite by Hayashi (1965)
{'key': 'S0009860400010314_CR21', 'first-page': '356', 'volume-title': 'X-ray Identification Procedures for Polycrystalline and Amorphous Materials.', 'author': 'Klug', 'year': '1974'} / X-ray Identification Procedures for Polycrystalline and Amorphous Materials. by Klug (1974)
{'key': 'S0009860400010314_CR15', 'first-page': '65', 'volume-title': 'Proc. Int. Clay Conference, Oxford, 1978', 'author': 'Goodman', 'year': '1979'} / Proc. Int. Clay Conference, Oxford, 1978 by Goodman (1979)
{'key': 'S0009860400010314_CR6', 'article-title': 'Mössbauer analysis of talc and chlorite', 'volume': '41', 'author': 'Blaauw', 'year': '1980', 'journal-title': 'J. Phys.'} / J. Phys. / Mössbauer analysis of talc and chlorite by Blaauw (1980)
10.1007/978-3-642-65917-1_7
10.1180/minmag.1975.040.309.11
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10.1346/CCMN.1976.0240406
10.1346/CCMN.1974.0220302
10.1080/11035897709455018
10.1346/CCMN.1979.0270108
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10.1346/CCMN.1980.0280304
10.1346/CCMN.1972.0200507
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{'key': 'S0009860400010314_CR10', 'article-title': 'On texture effects in M1 3/2-1/2 Mössbauer spectra', 'volume': '37', 'author': 'Ericsson', 'year': '1976', 'journal-title': 'J. Phys.'} / J. Phys. / On texture effects in M1 3/2-1/2 Mössbauer spectra by Ericsson (1976)
10.1346/CCMN.1972.0200504
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10.1180/mono-4.15
10.1346/CCMN.1968.0160507
{'key': 'S0009860400010314_CR34', 'first-page': '482', 'article-title': 'Dehydroxylation and rehydroxylation, oxidation, and reduction of micas', 'volume': '54', 'author': 'Vedder', 'year': '1969', 'journal-title': 'Amer. Mineral.'} / Amer. Mineral. / Dehydroxylation and rehydroxylation, oxidation, and reduction of micas by Vedder (1969)

Dates

Type	When
Created	19 years ago (Aug. 23, 2006, 7:33 a.m.)
Deposited	1 year, 2 months ago (July 3, 2024, 1:40 a.m.)
Indexed	2 months, 2 weeks ago (June 19, 2025, 10:02 a.m.)
Issued	42 years, 11 months ago (Oct. 1, 1982)
Published	42 years, 11 months ago (Oct. 1, 1982)
Published Online	1 year, 5 months ago (April 2, 2024)
Published Print	42 years, 11 months ago (Oct. 1, 1982)

Funders 0

None

BibTeX

@article{Borggaard_1982, title={Oxidation and Reduction of Structural Iron in Chlorite at 480°C}, volume={30}, ISSN={1552-8367}, url={http://dx.doi.org/10.1346/ccmn.1982.0300506}, DOI={10.1346/ccmn.1982.0300506}, number={5}, journal={Clays and Clay Minerals}, publisher={Cambridge University Press (CUP)}, author={Borggaard, Ole K. and Lindgreen, Holger B. and Mørup, Steen}, year={1982}, month=oct, pages={353–363} }

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  "abstract": "<jats:title>Abstract</jats:title><jats:p>An iron-rich chlorite, ripidolite, was oxidized by air-heating at 480\u00b0C, i.e., below the dehydroxylation temperature and subsequently reduced in hydrogen at the same temperature. On the basis of chemical, differential thermal, infrared, M\u00f6ssbauer, and X-ray powder diffraction analyses, Fe(II) seems to be present only in the 2:1 layer of the original chlorite in a type of site similar to that of Fe(II) in biotite, with OH in <jats:italic>cis</jats:italic>-positions. These data also suggest that octahedral Al and Fe(III) are located in the hydroxide sheet of the original chlorite. The structural changes of the mineral due to the oxidation and the subsequent reduction appear limited to minor structural rearrangements and, perhaps, to the introduction of OH in both <jats:italic>cis</jats:italic>- and <jats:italic>trans</jats:italic>-positions. The results of the investigation are in agreement with a reaction of the form: [Fe(II)OH]<jats:sup>+</jats:sup> \u21cb [Fe(III)O]<jats:sup>+</jats:sup> + H(H<jats:sup>+</jats:sup> + e<jats:sup>\u2212</jats:sup>).</jats:p>",
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