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Local environment of lanthanum ions in montmorillonite upon heating

Published online by Cambridge University Press:  09 July 2018

J. M. Trillo ,
M. D. Alba ,
M. A. Castro ,
A. Muñoz ,
J. Poyato  and
M. M. Tobías
J. M. Trillo
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, CSIC, PO Box 874, Sevilla, España
M. D. Alba
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, CSIC, PO Box 874, Sevilla, España
M. A. Castro
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, CSIC, PO Box 874, Sevilla, España
A. Muñoz
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, CSIC, PO Box 874, Sevilla, España
J. Poyato
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, CSIC, PO Box 874, Sevilla, España
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Abstract

Structural differences which occur on heating La-montmorillonite have been studied and compared with those for montmorillonite saturated with Na(I) and Li(I). Rehydration experiments show that La-montmorillonite swells after preheating up to 500°C. However, FT-IR spectra suggest partial migration of the La(III) cations from the interlamellar region to the structural sheets and(or) deprotonation of hydrated La(III) cations, followed by migration of the resulting protons to vacant octahedral sites. Additional measurements of X-ray absorption spectra (EXAFS, XANES) and heating to 700°C suggest that interlamellar hydrated La(III) partially deprotonates producing polyoxocations.

Type
Research Article
Information
Clay Minerals , Volume 27 , Issue 4 , December 1992 , pp. 423 - 434
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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