2026-06-28T10:34:45Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/506812023-08-26T09:23:09Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Súarez Barrios, Mercedes author García Romero, Emilia author Sánchez del Río, Manuel author Martinetto, Pauline author Dooryhée, Eric 2023-06-20T10:35:25Z 2023-06-20T10:35:25Z 2007 0009-8558 https://hdl.handle.net/20.500.14352/50681 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. eng The effect of the octahedral cations on the dimensions of the palygorskite cell journal article URL https://docta.ucm.es/bitstreams/7b1f2e86-f292-4d78-abcd-5374c99ec95f/download File MD5 61f6bf3c6ac4f92a8e371dd7610e172c 3116441 application/pdf 2007_Octaherdral_cations_palygorskite.pdf