Abstract
The sequence of hexagonal ordered distributions of trivalent cations that are possible in the octahedral layer of layered double hydroxides is clarified, including the link between the composition and the supercell a parameter. A plausible explanation is provided for the observed variation in the lower solid-solution limit.
Highlights
Layered double hydroxide (LDH) phases are derived from layered single hydroxides [i.e. -M(OH)2 phases] by the substitution of a fraction (x) of the divalent cations in the octahedral layer by trivalent cations
The maximum value of x and an explanation for the variation in the lower value The data collated for Mg–Al LDH systems in Fig. 2 indicate an interesting phenomenon at low x: the minimum value is variable, but it appears to occur at particular fixed values
SummaryThe sequence of hexagonal ordered distributions of trivalent cations that are possible in the main layer of Layered double hydroxide (LDH) phases has been clarified – including the composition and supercell parameter – and a plausible explanation has been provided for the observed variation in the lower value of x
Summary
School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, England The sequence of hexagonal ordered distributions of trivalent cations that are possible in the octahedral layer of layered double hydroxides is clarified, including the link between the composition and the supercell a parameter. A plausible explanation is provided for the observed variation in the lower solidsolution limit.
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