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Crystal Structure Modeling of a Highly Disordered Potassium Birnessite

Published online by Cambridge University Press:  28 February 2024

Kerry L. Holland  and
Jeffrey R. Walker
Kerry L. Holland*
Affiliation:
Department of Geology and Geography, Vassar College, Poughkeepsie, New York 12601
Jeffrey R. Walker
Affiliation:
Department of Geology and Geography, Vassar College, Poughkeepsie, New York 12601
*
†Present Address: Colorado School of Mines, Boulder, Colorado.
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Abstract

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The structure of a highly disordered synthetic birnessite was studied by comparing powder X-ray diffraction (XRD) data with calculated patterns generated by BIRNDIF and WILDFIRE© in an attempt to describe the nature of disorder and to estimate the size of the coherent diffracting domains. The material has a turbostratic stacking sequence and coherent diffracting domains that are 25 to 30 Å on a side in the ab plane (N1 = 5 unit cells, N2 = 10 unit cells) and which average 2.5 unit cells thick parallel to c. Turbostratic stacking probably results because there are few constraints on the relationship between adjacent layers.

Keywords

BirnessiteCrystal Structure ModelingTurbostratic Stacking
Type
Research Article
Information
Clays and Clay Minerals , Volume 44 , Issue 6 , December 1996 , pp. 744 - 748
Copyright
Copyright © 1996, The Clay Minerals Society

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