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GEOREF RECORD

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

M. Heuser, P. Andrieux, S. Petit and H. Stanjek
Iron-bearing smectites; a revised relationship between structural Fe, b cell edge lengths and refractive indices
Clay Minerals (March 2013) 48 (1): 97-103

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 (r (super 2) > 0.99); the relationship is b [A Aa] = 8.9977(0.0035) + 0.1117(0.0032)XFe (sub tot) . 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 (r (super 2) = 0.64) and with b (r (super 2) = 0.94).


ISSN: 0009-8558
EISSN: 1471-8030
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 48
Serial Issue: 1
Title: Iron-bearing smectites; a revised relationship between structural Fe, b cell edge lengths and refractive indices
Affiliation: Rheinisch-Westfaelische Technische Hochschule Aachen University, Clay and Interface Mineralogy, Aachen, Germany
Pages: 97-103
Published: 201303
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 28
Accession Number: 2013-032297
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Universite de Poitiers, FRA, France
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201320
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