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Cation Ordering in Synthetic Layered Double Hydroxides

Published online by Cambridge University Press:  28 February 2024

M. Vucelic ,
W. Jones  and
G. D. Moggridge
M. Vucelic
Affiliation:
Chemistry Department, University of Cambridge, Lensfield Rd., Cambridge CB2 1EW, United Kingdom
W. Jones
Affiliation:
Chemistry Department, University of Cambridge, Lensfield Rd., Cambridge CB2 1EW, United Kingdom
G. D. Moggridge
Affiliation:
Chemical Engineering Department, University of Cambridge, Pembroke St., Cambridge CB2 3RA, United Kingdom
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Abstract

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A combined powder X-ray diffraction (XRD) and X-ray absorption (XAS) study of Fe(III) cation ordering within pyroaurite is described. It is concluded that there is no correlation between Fe(III) cation positions over distances of a few tens of angstroms, but that there is a very high level of local ordering, involving the absence of Fe(III)-Fe(III) neighbors. These observations are rationalized in terms of a significant frequency of lattice defects in the form of cation vacancies or Mg for Fe(III) substitutions. These results are expected to be generalizable to other M(II)/M(III) layered double hydroxides (LDHs), but are in contrast to the long-range cation ordering observed in Li/Al LDHs. This raises the interesting possibility of differing properties and stabilities based on the degree of cation ordering.

Keywords

Cation OrderingLDHPyroauriteXASXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 6 , December 1997 , pp. 803 - 813
Copyright
Copyright © 1997, The Clay Minerals Society

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