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Site Occupancies by Iron in Nontronites

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Abstract:

- 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.

Keywords: -CHEMICAL ANALYSES; EXAFS; NEAR IR; NONTRONITES; OCCUPANCY; OCTAHEDRAL FE; SITE; SMECTITES; STRUCTURAL FORMULA; TETRAHEDRAL FE; X-RAY DIFFRACTION; XANES

Document Type: Research Article

DOI: http://dx.doi.org/10.1346/000986002760832829

Publication date: April 1, 2002

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