%0 Journal Article
%A Súarez Barrios, Mercedes
%A García Romero, Emilia
%A Sánchez del Río, Manuel
%A Martinetto, Pauline
%A Dooryhée, Eric
%T The effect of the octahedral cations on thedimensions of the palygorskite cell
%D 2007
%@ 0009-8558
%U https://hdl.handle.net/20.500.14352/50681
%X High-resolution synchrotron X-ray diffraction recorded on a collection ofpalygorskites with different chemical compositions (obtained by analytical electron microscopy)permits unambiguous correlation of the crystallographic parameters a (or a sin b if a monoclinicphase is considered) with the nature of the octahedral sheet, i.e. with both the number of octahedralpositions that are occupied and the type of octahedral cation. No significant changes in the latticeparameters b and c are observed. The unit cell modification consists essentially of an expansion in aas the number of cations with larger ionic radii (Mg2+ and Fe3+) predominates over smaller cations(Al3+). A linear dependency of a (or a sin b) on the chemical composition of the octahedral sheet wasobtained that can be used for classifying palygorskite into compositional groups, using onlyconventional diffraction data, without the need for chemical analyses.
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