New (Ni, Co)-based layered double hydroxides with intercalated oxometalate (Mo, W) species, obtained by chimie douce reactions
Language
en
Article de revue
This item was published in
Journal of Materials Chemistry. 2002, vol. 12, n° 4, p. 1035-1043
Royal Society of Chemistry
English Abstract
Layered double hydroxides (LDHs), containing intercalated oxometalate (Mo, W) species, were obtained by chimie douce reactions from NaNi1 − yCoyO2 cobalt substituted sodium nickelates (0.10 ≤ y ≤ 0.40). The X-ray diffraction ...Read more >
Layered double hydroxides (LDHs), containing intercalated oxometalate (Mo, W) species, were obtained by chimie douce reactions from NaNi1 − yCoyO2 cobalt substituted sodium nickelates (0.10 ≤ y ≤ 0.40). The X-ray diffraction (XRD), infrared (IR) and extended X-ray absorption fine structure (EXAFS) studies show that, in both cases, M2O72− anions (M[double bond, length as m-dash]Mo, W), made of corner-sharing tetrahedra, are intercalated. In these MO4 tetrahedra, the M-O bond with the bridging oxygen is elongated compared to the other ones, and the M-O-M angle is close to 115°. Oxygen atoms belonging to water molecules are pointing to some faces of the MO4 tetrahedra. The presence of such peculiar intercalated species, as well as the existence of an hydrogen bond network, leads to local distortions within the slabs, which entails a "turbotratic type" shape of the XRD patterns.Read less <
English Keywords
Nickel
Cobalt
Hydroxides
Chimie douce
Chemical reactions
Molybdenum
Tungsten
Intercalation compounds
Origin
Hal imported