Site occupancies by iron in nontronites
By W. Gates, P. Slade, A. Manceau, B. Lanson. 2002
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Twelve nontronites and two ferruginous smectites have been characterized with respect to Fe3+ occupancy of tetrahedral sites. The techniques used were near infrared, Fe-K X-ray absorption near-edge and X-ray absorption fine-structure spectroscopies, along with two X-ray diffraction techniques. The results show that calculations of the structural formulae of many nontronites should be adjusted to include Fe3+ in tetrahedral sites. The nontronite from Spokane County, Washington, (∼44% Fe2O3) is essentially an end-member with its non-siliceous tetrahedral sites occupied by Fe3+. Samples with chemical compositions similar to Garfield nontronite (∼36.5% Fe2O3) may have small amounts (<5% of total Fe3+) of tetrahedral Fe3+. Tetrahedral Fe3+ is unlikely to be present in samples containing less than ∼;34% Fe2O3.
Subfields: Artificial Intelligence, Biomaterials, Geophysics
View Paper: https://www.semanticscholar.org/paper/4a6a9909109498898ea2e2e8834f0876994c9dbd
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Citations in the corpus
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