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Título

Effect of acid treatment on the structure of sepiolite.

AutorYerba-Rodríguez, A.; Martín-Ramos, J. D.; Rey, F. del; Viseras, C.; López-Galindo, A.
Palabras claveSepiolite structure
Acid treatment
X-ray powder diffraction
Fecha de publicaciónsep-2003
EditorMineralogical Society (Great Britain)
CitaciónClay Minerals 38(3): 353-360 (2003)
ResumenAn ab initio determination of the structure of sepiolite after acid treatment (HCl 0.5 N for 24 h) was carried out using X-ray powder diffraction data. After acid treatment, the sections normal to the a and c axes presented discontinuities, ~2.25 Å wide, parallel to the (010) plane, with no electronic density maxima, thus suggesting that adjacent planes are joined by van der Waals-like residual links. Partial dissolution was detected on both octahedral and tetrahedral sheets, beginning by breaking the ribbons not along the edges, but in the centre, thus creating a 5.20x6.79 Å tunnel along the a axis. By interrupting the tetrahedral sheet, this mechanism changes the phyllosilicate-like nature of the sepiolite to an inosilicate-like structure.
Versión del editorhttp://dx.doi.org/10.1180/0009855033830101
URIhttp://hdl.handle.net/10261/18998
DOI10.1180/0009855033830101
ISSN0009-8558
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