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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

References

Bish, D.L. and Giese, R.. 1981. Interlayer bonding in IIb chlorite. Am Mineral 66: 1216–1220.Google Scholar
Burns, R.G. and Burns, V.M.. 1976. Mineralogy of ferromanganese nodules. In: Glasby, G.P., editor. Marine manganese deposits. Amsterdam: Elsevier Science 554 p.Google Scholar
Giovanoli, R., Stähl, E. and Feitknecht, W.. 1970. Über Oxihydroxides des vierwertigen Mangans mit Schichtengitter, 1. Mitteilung: Natiummangan(II,III)manganat(IV). Helv Chim Acta 53: 209–220.CrossRefGoogle Scholar
Moore, J.N., Walker, J.R. and Hayes, T.H.. 1990. Reaction scheme for the oxidation of As(III) to As(V) by birnessite. Clays Clay Miner 38: 549–555.CrossRefGoogle Scholar
Oscarson, D.W., Huang, P.M. and Liaw, W.K.. 1981. The role of manganese in the oxidation of arsenite by freshwater lake sediments. Clays Clay Miner 29: 219–225.CrossRefGoogle Scholar
Post, J.E. and Appleman, D.E.. 1988. Chalcophanite, ZnMn3C7·3H2O: New crystal-structure determinations. Am Mineral 73: 1401–1404.Google Scholar
Post, J.E. and Veblen, D.R.. 1990. Crystal structure determinations of synthetic sodium, magnesium, and potassium birnessite using TEM and the Rietveld method. Am Mineral 75: 477–489.Google Scholar
Reynolds, R.C. Jr. 1985. CLAYDIF: A computer program for the calculation of one-dimensional diffraction patterns of pure clay minerals. Hanover, NH: RC Reynolds, Jr, 8 Brook Rd.Google Scholar
Reynolds, R.C. Jr. 1993. Three-dimensional X-ray powder diffraction from disordered illite: simulation and interpretation of the diffraction patterns. In: Reynolds, R.C. Jr., Walker, J.R., editors. CMS workshop lectures, vol 5, Computer applications to X-ray powder diffraction analysis of clay minerals. Boulder, CO: The Clay Minerals Society. p 43–78.Google Scholar
Reynolds, R.C. Jr. 1994. WILDFIRE©: A computer program for the calculation of three-dimensional X-ray diffraction patterns for mica polytypes and their disordered variations. Hanover, NH: RC Reynolds, Jr, 8 Brook Rd.Google Scholar
Wadsley, A.D.. 1955. The crystal structure of chalcophanite, ZnMn3C7·3H2O. Acta Crystallogr 8: 165–172.CrossRefGoogle Scholar
Wright, A.C.. 1973. A compact representation for atomic scattering factors. Clays Clay Miner 21: 489–490.CrossRefGoogle Scholar