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Formation at 300°C of a high-temperature disilicate from hydrated lutetium in a layered aluminosilicate

Published online by Cambridge University Press:  09 July 2018

M. A. Castro ,
M. D. Alba ,
R. Alvero ,
A. I. Becerro ,
A. Muñoz-Paez  and
J. M. Trillo
M. A. Castro
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, P.O. Box 874, Sevilla, Spain
M. D. Alba
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, P.O. Box 874, Sevilla, Spain
R. Alvero
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, P.O. Box 874, Sevilla, Spain
A. I. Becerro
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, P.O. Box 874, Sevilla, Spain
A. Muñoz-Paez
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, P.O. Box 874, Sevilla, Spain
J. M. Trillo
Affiliation:
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, P.O. Box 874, Sevilla, Spain
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Abstract

The interaction between interlamellar Lu(III) cations and the layered silicate structure has been studied by means of MAS-NMR, XRD and EDX. Irreversible fixation of exchangeable Lu(III) cations upon hydrothermal treatment at 300°C of Lu-saturated montmorillonite is reported, through the formation of the crystalline phase Lu2Si2O7. It is shown that the lowest temperature previously described for this reaction, 400°C, does not indicate a thermodynamic boundary. This basic solid-state finding is relevant for some clay applications such as those related to the safety of nuclear waste repositories with engineering barriers.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 4 , December 1996 , pp. 507 - 512
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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