DOI: 10.1346/ccmn.1980.0280505. Dehydroxylation of Dioctahedral Phyllosilicates

Dehydroxylation of Dioctahedral Phyllosilicates

10.1346/ccmn.1980.0280505

Crossref journal-article

Cambridge University Press (CUP)

Clays and Clay Minerals (56)

Abstract

AbstractMössbauer spectroscopy of dioctahedral phyllosilicates showed that on dehydroxylation iron which originally occupied M(2) and M(l) sites became, respectively, 5- and 6-coordinated. The 6-coordinated sites are very distorted. No migration of cations occurs in the course of heating the specimens for 1–3 hr at 600°–700°C.By using a combination of several physicochemical methods, different successive stages of the dehydroxylation process could be distinguished: (1) migration of protons; (2) localized dehydroxylation of individual associations without significant change in the overall configuration of the octahedral sheets; and (3) loss of most of the hydroxyl groups with concomitant changes in the cell dimensions. Penetration of Li into the octahedral sheets does not affect the course of the reaction, but reduces the dehydroxylation temperature and the stability of the products.Dehydroxylation was preceded by or associated with the oxidation of any divalent iron present. Fe3+ derived from Fe2+ was indistinguishable by Mössbauer spectroscopy from iron initially present in the trivalent form. High concentrations of Fe lower the dehydroxylation temperature and reduce the stability of the dehydroxylate to the extent that partial disintegration may precede complete dehydroxylation.

Bibliography

Heller-Kallai, L., & Rozenson, I. (1980). Dehydroxylation of Dioctahedral Phyllosilicates. Clays and Clay Minerals, 28(5), 355â368.

Authors 2

L. Heller-Kallai (first)
I. Rozenson (additional)

References 25 Referenced 87

10.1007/BF00633576
Bystrom-Brusewitz, A. M. , (1976) Studies on the Li test to distinguish between beidellite and montmorillonite Proc. Intern. Clay Conf., Mexico, 1975 419–428.
{'volume-title': 'Bentonites: Geology, Mineralogy, Properties and Uses', 'year': '1978', 'author': 'Grim', 'key': 'S0009860400008855_CR11'} / Bentonites: Geology, Mineralogy, Properties and Uses by Grim (1978)
10.1016/0022-3697(75)90019-0
10.1524/zkri.1967.125.125.437
Heller-Kallai, L. , (1976) Interaction of montmorillonite with alkali halides Proc. Intern. Clay Conf., Mexico, 1975 361–372.
{'key': 'S0009860400008855_CR12', 'first-page': '567', 'article-title': 'A spectroscopic investigation of manganian andalusite', 'volume': '16', 'author': 'Halenius', 'year': '1978', 'journal-title': 'Can. Mineral.'} / Can. Mineral. / A spectroscopic investigation of manganian andalusite by Halenius (1978)
Rozenson, I. Bauminger, E. R. and Heller-Kallai, L. , (1979) Mössbauer spectra of iron in 1:1 phyllosilicates Amer. Mineral. .
{'key': 'S0009860400008855_CR2', 'first-page': '175', 'article-title': 'Cation ordering and pseudosymmetry in layer silicates', 'volume': '60', 'author': 'Bailey', 'year': '1975', 'journal-title': 'Amer. Mineral.'} / Amer. Mineral. / Cation ordering and pseudosymmetry in layer silicates by Bailey (1975)
{'key': 'S0009860400008855_CR24', 'first-page': '2123', 'article-title': 'The dependence of the wavelength of Al Kα radiation from alumino-silicates on the Al-O distance', 'volume': '56', 'author': 'Wardle', 'year': '1971', 'journal-title': 'Amer. Mineral.'} / Amer. Mineral. / The dependence of the wavelength of Al Kα radiation from alumino-silicates on the Al-O distance by Wardle (1971)
{'volume-title': 'Mössbauer Spectroscopy', 'year': '1974', 'author': 'Bancroft', 'key': 'S0009860400008855_CR3'} / Mössbauer Spectroscopy by Bancroft (1974)
{'key': 'S0009860400008855_CR7', 'first-page': '447', 'article-title': 'A refinement of the crystal structures of epidote, allanite and hancockite', 'volume': '56', 'author': 'Dollase', 'year': '1971', 'journal-title': 'Amer. Mineral.'} / Amer. Mineral. / A refinement of the crystal structures of epidote, allanite and hancockite by Dollase (1971)
10.1346/CCMN.1978.0260215
{'key': 'S0009860400008855_CR17', 'first-page': '676', 'article-title': 'Investigation of effect of thermal treatment on hydromica by radiospectroscopy', 'volume': '6', 'author': 'Matyash', 'year': '1969', 'journal-title': 'Geochem. Intern.'} / Geochem. Intern. / Investigation of effect of thermal treatment on hydromica by radiospectroscopy by Matyash (1969)
{'volume-title': 'Reduction-oxidation reactions in dioctahedral clays', 'year': '1975', 'author': 'Rozenson', 'key': 'S0009860400008855_CR18'} / Reduction-oxidation reactions in dioctahedral clays by Rozenson (1975)
10.1180/mono-4
10.1346/CCMN.1975.0230609
10.1346/CCMN.1978.0260202
10.1346/CCMN.1977.0250204
10.1080/11035896209449221
10.1107/S0365110X62001930
10.1346/CCMN.1971.0190306
{'key': 'S0009860400008855_CR25', 'first-page': '732', 'article-title': 'The crystal structure of pyrophyllite 1Tc and its dehydroxylate', 'volume': '57', 'author': 'Wardle', 'year': '1972', 'journal-title': 'Amer. Mineral.'} / Amer. Mineral. / The crystal structure of pyrophyllite 1Tc and its dehydroxylate by Wardle (1972)
10.1346/CCMN.1980.0280510
10.1524/zkri.1961.115.3-4.269

Dates

Type	When
Created	18 years, 11 months ago (Sept. 12, 2006, 2:32 a.m.)
Deposited	3 weeks, 4 days ago (Aug. 5, 2025, 5:32 a.m.)
Indexed	1 day, 14 hours ago (Aug. 29, 2025, 6:24 a.m.)
Issued	44 years, 10 months ago (Oct. 1, 1980)
Published	44 years, 10 months ago (Oct. 1, 1980)
Published Online	1 year, 1 month ago (July 1, 2024)
Published Print	44 years, 10 months ago (Oct. 1, 1980)

Funders 0

None

BibTeX

@article{Heller_Kallai_1980, title={Dehydroxylation of Dioctahedral Phyllosilicates}, volume={28}, ISSN={1552-8367}, url={http://dx.doi.org/10.1346/ccmn.1980.0280505}, DOI={10.1346/ccmn.1980.0280505}, number={5}, journal={Clays and Clay Minerals}, publisher={Cambridge University Press (CUP)}, author={Heller-Kallai, L. and Rozenson, I.}, year={1980}, month=oct, pages={355–368} }

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  "abstract": "<jats:title>Abstract</jats:title><jats:p>M\u00f6ssbauer spectroscopy of dioctahedral phyllosilicates showed that on dehydroxylation iron which originally occupied M(2) and M(l) sites became, respectively, 5- and 6-coordinated. The 6-coordinated sites are very distorted. No migration of cations occurs in the course of heating the specimens for 1\u20133 hr at 600\u00b0\u2013700\u00b0C.</jats:p><jats:p>By using a combination of several physicochemical methods, different successive stages of the dehydroxylation process could be distinguished: (1) migration of protons; (2) localized dehydroxylation of individual associations without significant change in the overall configuration of the octahedral sheets; and (3) loss of most of the hydroxyl groups with concomitant changes in the cell dimensions. Penetration of Li into the octahedral sheets does not affect the course of the reaction, but reduces the dehydroxylation temperature and the stability of the products.</jats:p><jats:p>Dehydroxylation was preceded by or associated with the oxidation of any divalent iron present. Fe<jats:sup>3+</jats:sup> derived from Fe<jats:sup>2+</jats:sup> was indistinguishable by M\u00f6ssbauer spectroscopy from iron initially present in the trivalent form. High concentrations of Fe lower the dehydroxylation temperature and reduce the stability of the dehydroxylate to the extent that partial disintegration may precede complete dehydroxylation.</jats:p>",
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