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Iron-bearing smectites: a revised relationship between structural Fe, b cell edge lengths and refractive indices

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Abstract:

Structural iron in smectites correlates with the cell edge length b and increases the refractive index. The cell edge length b is usually obtained from the position of the (060) reflection, but in this work we show that such b values differ from the values obtained from Rietveld fits because contributions from (hkl) reflections shift the position of the (060) reflection. The correlation between Fe and cell edge length b was significant (r2 > 0.99); the relationship is b [Å] = 8.9977(0.0035) + 0.1117(0.0032) × Fetot. Furthermore, we present for the first time measurements of the refractive index n of Fe-bearing smectites, applying a recently published turbidity method (Weidler & Friedrich, 2007). The refractive index correlates both with structural iron (r2 = 0.64) and with b (r2 = 0.94).

Keywords: BEIDELLITE; CELL EDGE LENGTH B; MONTMORILLONITE; REFRACTIVE INDEX; SMECTITE; STRUCTURAL IRON; TURBIDITY MEASUREMENT; VIS

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/claymin.2013.048.4.06

Publication date: March 1, 2013

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