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Refinement of the Kaolinite Structure From Single-Crystal Synchrotron Data

Published online by Cambridge University Press:  28 February 2024

R. B. Neder ,
M. Burghammer ,
TH. Grasl ,
H. Schulz ,
A. Bram  and
S. Fiedler
R. B. Neder*
Affiliation:
Institut für Kristallographie, Theresienstr. 41, 80333 München, Germany
M. Burghammer*
Affiliation:
Institut für Kristallographie, Theresienstr. 41, 80333 München, Germany
TH. Grasl
Affiliation:
Institut für Kristallographie, Theresienstr. 41, 80333 München, Germany
H. Schulz
Affiliation:
Institut für Kristallographie, Theresienstr. 41, 80333 München, Germany
A. Bram*
Affiliation:
ESRF, B.P. Box 220, 38043 Grenoble, France
S. Fiedler
Affiliation:
ESRF, B.P. Box 220, 38043 Grenoble, France
*
†Present address: Mineralogisches Institut, Am Hubland, 97074 Würzburg, Germany.
‡Present address: ESRF, B,P. Box 220, 38043 Grenoble, France.
§Present address: Siemens AG.
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Abstract

The crystal structure of single crystals of kaolinite from Keokuk, Iowa, was refined using data measured at the microfocus X-ray beamline at the ESRF, Grenoble, France (λ = 0.6883, T = room temperature). The volume of the crystals was 8 and 0.8 μm3, respectively. Unit-cell parameters are: a = 5.154(9) Å, b = 8.942(4) Å, c = 7.401(10) Å, α = 91.69(9)°, β = 104.61(5)°, γ = 89.82(4)°. Space group Cl is consistent with the observed data. All non-hydrogen atoms were independently refined with anisotropic displacement parameters. The positions and isotropic displacement parameters for the three interlayer H atoms were refined also. The position of the intralayer H was found by difference-Fourier methods, although refinement was not possible. Difference-Fourier maps suggested large anisotropic displacement vectors of this intralayer H, however, no evidence for a second maximum was found. The diffraction patterns show diffuse scattering in streaks parallel to [001]* through hkl reflections with hk ≠ 0, which is caused by stacking faults. No twinning was observed for either of the two crystals.

Keywords

Crystal StructureDiffuse ScatteringH-PositionsKaoliniteMicrocrystalSingle Crystal RefinementSynchrotron Radiation
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 4 , August 1999 , pp. 487 - 494
Copyright
Copyright © 1999, The Clay Minerals Society

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