Abstract
The substitution in layered double hydroxide-like phases (LDH) of composition (\(\matrix{ {{{\left( {{\rm{Co}}_{1 - y}^{2 + }{\rm{Cu}}_y^{2 + }} \right)}_2}{\rm{A}}{{\rm{l}}^{3 + }}{{\left( {{\rm{OH}}} \right)}_6}{\rm{C}}{{\rm{l}}^ - } \cdot n{{\rm{H}}_{\rm{2}}}{\rm{O}}} & {\left( {0 \leqslant y \leqslant 1} \right)} \cr } \))2Al3+(OH)6Cl−·nH2O (0 ⩽ y ⩽ 1) was studied by X-ray diffraction and X-ray absorption spectroscopy. It was found that the lamellar character is maintained over the entire range of the substitution. The local order for the composition {Co2Al} is typical of brucite-like sheets, whereas segregation into small domains may explain the results obtained when the percentage of Cu atoms is increased. The {Cu2Al} end-member material presents alocal order around the Cu atoms closely related to the botallackite structure as present in basic layered Cu salts, with the presence of two distinct Cu-Cu distances.
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Leroux, F., Moujahid, E.M., Roussel, H. et al. Local order of the transition metals for the substitution (Co1−yCuy)2Al(OH)6Cl·nH2O (0 ⩽ y ⩽ 1) in a copper-aluminum-layered double hydroxide-like phase. Clays Clay Miner. 50, 254–264 (2002). https://doi.org/10.1346/000986002760832856
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DOI: https://doi.org/10.1346/000986002760832856