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The effect of the octahedral cations on the dimensions of the palygorskite cell



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Súarez Barrios, Mercedes y García Romero, Emilia y Sánchez del Río, Manuel y Martinetto, Pauline y Dooryhée, Eric (2007) The effect of the octahedral cations on the dimensions of the palygorskite cell. Clay minerals, 42 . pp. 287-297. ISSN 0009-8558

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URL Oficial: http://www.minersoc.org/clayminm.html


High-resolution synchrotron X-ray diffraction recorded on a collection of
palygorskites with different chemical compositions (obtained by analytical electron microscopy)
permits unambiguous correlation of the crystallographic parameters a (or a sin b if a monoclinic
phase is considered) with the nature of the octahedral sheet, i.e. with both the number of octahedral
positions that are occupied and the type of octahedral cation. No significant changes in the lattice
parameters b and c are observed. The unit cell modification consists essentially of an expansion in a
as 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 was
obtained that can be used for classifying palygorskite into compositional groups, using only
conventional diffraction data, without the need for chemical analyses.

Tipo de documento:Artículo
Palabras clave:Palygorskite, Synchrotron, X-ray diffraction, Transmission electron microscopy
Materias:Ciencias > Geología > Mineralogía
Código ID:21648
Depositado:03 Jun 2013 11:41
Última Modificación:11 Dic 2018 08:46

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