title: Clarification of possible ordered distributions of trivalent cations in layered double hydroxides and an explanation for the observed variation in the lower solid-solution limit.
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.
authors.affiliation: School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, England.
authors.forename: Ian G
authors.initials: IG
authors.lastname: Richardson
keywords: layered double hydroxide; supercell parameter; trivalent cations