Abstract
Iron phyllosilicates with 1:1 and 2:1 layer structures were prepared from silicic acid, ferrous sulfate and sodium hydroxide. Hydrothermal treatment at 100–200°C of a reaction mixture with an initial Fe/Si ratio of 1.5 gave the 2:1 iron phyllosilicate, whereas a Fe/Si ratio of 2.25 gave the 1:1 phyllosilicate. The 57Fe Mössbauer spectroscopy showed that 60% of the iron in the 1:1 phyllosilicate is ferrous, versus only 3% in the 2:1 phyllosilicate. The values of quadrupole coupling showed that the iron-oxygen tetrahedra and octahedra in the 2:1 phyllosilicate were more deformed than those in the 1:1 phyllosilicate.
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Mizutani, T., Fukushima, Y., Okada, A. et al. Synthesis of 1:1 And 2:1 Iron Phyllosilicates and Characterization of Their Iron State by Mössbauer Spectroscopy. Clays Clay Miner. 39, 381–386 (1991). https://doi.org/10.1346/CCMN.1991.0390407
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DOI: https://doi.org/10.1346/CCMN.1991.0390407