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Clays and Clay Minerals; April 2002; v. 50; no. 2; p. 254-264
© 2002 Clay Minerals Society
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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

Fabrice Leroux1,*, El Mostafa Moujahid1, Hervé Roussel2, Anne-Marie Flank2, Valérie Briois2 and Jean-Pierre Besse1

1 Laboratoire des Matériaux Inorganiques, CNRS-UPRES-A n°6002, Université Blaise Pascal, 63177 Aubière cédex, France
2 LURE, Centre Universitaire Paris Sud, Bât 209D, BP 34, 91898 Orsay cédex, France

* E-mail address of corresponding author: fleroux{at}chimtp.univ-bpclermont.fr

The substitution in layered double hydroxide-like phases (LDH) of composition (Co2+1–yCuy2+)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 a local 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.

Key Words: Botallackite Structure • Layered Double Hydroxide • X-ray Absorption Spectroscopy






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