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Hydration and hydrolysys of Sm3+ and Eu3+ in a clay interlayer: a neutron diffraction study with isotopic substitution

Oleg Sobolev 1 Laurent Charlet 1 G. J. Cuello 2 A. Gehin 1 J. Brendle 3
1 LGIT - Laboratoire de Géophysique Interne et Tectonophysique
2 ILL - Institut Laue-Langevin
3 LMPC
Abstract : The coordination of Sm and Eu in the montmorillonite interlayer was studied by neutron diffraction with isotopic substitution. It was found that the number of hydrogen atoms nearest to Sm and Eu were less (NH=5.5±2.0) than oxygen nearest atoms (NO=7.5±1.0). This means that the Sm and Eu are not surrounded only by hydration water molecules, but they are in contact with the oxygen siloxane atoms of the clay basal plane surface. It was found that the number of oxygen atoms of the clay surface giving a contribution to the total coordination number NO should be NOclay≤3. Therefore, the deficit of hydrogen atoms in the first coordination shell of Sm and Eu should be explained supposing that the lanthanide cations are partially hydrolyzed.
Keywords : Neutron diffraction Hydration Samarium Europium Clay minerals
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Submitted on : Tuesday, March 31, 2009 - 1:52:08 PM
Last modification on : Friday, September 25, 2020 - 3:13:50 AM

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Oleg Sobolev, Laurent Charlet, G. J. Cuello, A. Gehin, J. Brendle. Hydration and hydrolysys of Sm3+ and Eu3+ in a clay interlayer: a neutron diffraction study with isotopic substitution. Radiochimica Acta, R Oldenbourg Verlag GMBH, 2008, 96 (9-11), pp.679 à 683. ⟨10.1524/ract.2008.1553⟩. ⟨insu-00372149⟩

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