A. Munozpaez et al., STRUCTURE OF LU3+ AND LA3+ IONS INTERCALATED WITHIN LAYERED CLAYS AS DETERMINED BY EXAFS, Physica. B, Condensed matter, 209(1-4), 1995, pp. 622-624
La3+ and Lu3+ ions are intercalated within the interlamellar space of
montmorillonite as aquocomplexes. Heating at 700 degrees C for 6 h ind
uces a structural change around the lanthanide ions resulting in the f
ormation of oxide-type environments. The change is complete only for t
he lutetium sample, which is consistent with the lower value of the de
hydration enthalpy of this cation.