1978
DOI: 10.1346/ccmn.1978.0260202
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Reduction and Oxidation of Fe3+ in Dioctahedral Smectites—III. Oxidation of Octahedral Iron in Montmorillonite

Abstract: A~tract---Structural Fe 2+ in montmorillonite is readily oxidized by contact with water, salt solutions or on mild heating. This is shown clearly by the Mtssbauer spectra and is associated with a sharpening of the infrared absorption near 880 cm 1. It was inferred that this band comprises the Fe 2+ OH--AI and Fe 3 § OH AI deformations. The rate at which oxidation occurs depends on the exchangeable cations. High acidity of the interlayers is conducive to oxidation, as is contact with Cu2+-containing solutions o… Show more

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Cited by 64 publications
(20 citation statements)
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“…Substitution of Li in the interlayers led to partial oxidation of Fe 2+, as previously reported (Rozenson and Heller-Kallai, 1978), but did not affect the M6ssbauer spectra of either the unheated or the heated material. The sample, however, differed from natural (largely Na-substituted) montmorillonite in several other respects: the OH bending vibrations were modified, as described by Calvet and Prost (1971), who attributed the changes to partial penetration of Li into the octahedral sheets, h20 decreased, as for natural montmorillonite, but the final value was reached at a considerably lower temperature.…”
Section: Li-montmorillonite (Figure 6)supporting
confidence: 85%
See 1 more Smart Citation
“…Substitution of Li in the interlayers led to partial oxidation of Fe 2+, as previously reported (Rozenson and Heller-Kallai, 1978), but did not affect the M6ssbauer spectra of either the unheated or the heated material. The sample, however, differed from natural (largely Na-substituted) montmorillonite in several other respects: the OH bending vibrations were modified, as described by Calvet and Prost (1971), who attributed the changes to partial penetration of Li into the octahedral sheets, h20 decreased, as for natural montmorillonite, but the final value was reached at a considerably lower temperature.…”
Section: Li-montmorillonite (Figure 6)supporting
confidence: 85%
“…It was noted previously that, on oxidation at ambient temperatures, Fe z+ in montmorillonite became indistinguishable from Fe 3+ by M6ssbauer spectroscopy (Rozenson and Heller-Kallai, 1978). In the original mineral Fe z § occupied M(2) sites preferentially.…”
Section: Oxidation Of Fe Z+mentioning
confidence: 81%
“…A correlation between oxidation reactions on clays and the acidity of the interlayers was observed previously (Rozenson and Heller-Kallai, 1978): structural iron oxidized more rapidly, the greater the surface acidity. This relationship was attributed to the more efficient removal of the anionic oxygen species, formed by oxidation of iron, by reaction with interlayer protons.…”
Section: Clays and Clay Mineralssupporting
confidence: 68%
“…Two absorption peaks observed in Na-montmorillonite are due to the Fe 2+ and Fe 3+ in the crystal of the montmorillonite. 10) In Fe-montmorillonite, a couple of new absorption peaks (isomer shift is 1.06 mm·s −1 and quadrupole splitting is 1.72 mm·s −1 ) were observed. These peaks are attributed to the sorbed Fe 2+ ions.…”
Section: Resultsmentioning
confidence: 95%