Fe, Mg and Al distribution in the octahedral sheet of montmorillonites. An infrared study in the OH-bending region

被引：91

作者：

Vantelon, D ^{[1
]}

Pelletier, M ^{[1
]}

Michot, LJ ^{[1
]}

Barres, O ^{[1
]}

Thomas, F ^{[1
]}

机构：

[1] INPL, CNRS, UMR 7569, Lab Environm & Mineral, F-54501 Vandoeuvre Les Nancy, France

来源：

CLAY MINERALS | 2001年 / 36卷 / 03期

关键词：

montmorillonite; smectite; bentonite; IR spectroscopy; OH-bending region; octahedral cations;

D O I：

10.1180/000985501750539463

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ten montmorillonites of different origins with variable Fe contents were analysed using transmission IR spectroscopy. Special attention was devoted to the OH-bending region to obtain information about the distribution of octahedral cations. For low to medium Fe contents (less than or equal to0.56 per Si-8 formula unit), a linear relationship between the position of the delta (AlFeOH) band and Fe content was observed. Such correlation might be explained by changes in the cis-trans occupancy of Fe in the octahedral sheet. Deconvolution of the OH-bending domain allows us to discriminate three Components (delta (AlAlOH), delta (AlMgOH) and delta (AlFeOH)) which are correlated with cation abundances derived from chemical analysis. The relative area of each band can then be compared with theoretical areas calculated assuming a fully random distribution of cations in the octahedral sheet. Using such treatment, eight of the 10 montmorillonites studied presented a nearly randomized octahedral distribution. The two samples from Wyoming were clearly different as they exhibited a strong ordering tendency.

引用

页码：369 / 379

页数：11

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