%0 Journal Article
%A Súarez Barrios, Mercedes
%A García Romero, Emilia
%T FTIR spectroscopic study of palygorskite: Influence of thecomposition of the octahedral sheet
%D 2006
%@ 0169-1317
%U https://hdl.handle.net/20.500.14352/49741
%X The influence of chemical composition to position and intensity of the absorption bands observed in the FTIR spectra ofpalygorskite has been studied by a detailed comparative study of six samples. Palygorskites studied have high purity and differentchemical composition. At one extreme, there are two samples that correspond to Mg-rich palygorskites, at the other extreme asample with a composition very close to the theoretical formula of this mineral, and there are three further samples whose structuralformulae lie between these extremes. The position of the bands identified in the FTIR spectra of the palygorskites studied is similarfor all samples, but there are some differences in their intensity, which are significant. Analysing these intensities, valuableinformation about the distribution of cations along the octahedral sheet has been obtained. Isomorphic substitution in octahedralsheet occurs only in M2 position. Al, and Fe may occupy M2 position whereas Mg can occupy all possible sites: M1, M2 and M3.
%~