Random stacking of a commensurate guest layer in an ordered host: Ni/Al layer-double-hydroxides

D. R. Hines, G. T. Seidler, M. M.J. Treacy, S. A. Solin

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


In the solid solution layer double hydroxides with the general composition [Ni1-xAlx(OH)2] [(CO3)x/2·yH2O], 0 ≤ x ≤ 0.4 the Ni2+/Al3+ ions decorate a positively charged triangular lattice that is sandwiched between two hydroxyl layers to form brucite-like host layers. Guest layers of co-intercalated water molecules and carbonate anions oriented with their three-fold axes perpendicular to the basal plane occupy the galleries. For x = 0.30, the carbonate ions form a (√13 × √13)R13.9° in-plane superlattice structure relative to the host layers which themselves exhibit an ABC stacking sequence that is only slightly (20%) disordered. Despite their commensurate structure, the guest layers yield Warren line shape X-ray reflections characteristic of a random stacking arrangement. This unusual result is attributed to the high (26-fold) degeneracy of the ground state structure of the guest layer.

Original languageEnglish (US)
Pages (from-to)835-839
Number of pages5
JournalSolid State Communications
Issue number11
StatePublished - Mar 1997
Externally publishedYes


  • A. insulators
  • C. crystal structure and symmetry
  • D. order-disorder effects
  • X-ray scattering

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry


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