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Hydration and hydrolysis of samarium (III) in montmorillonite clay: a neutron diffraction study

O. V. Sobolev 1 L. Charlet 1 G. J. Cuello 2 A. Gehin 1 J. Brendle 3 Nicolas Geoffroy 1
1 LGIT - Laboratoire de Géophysique Interne et Tectonophysique
2 ILL - Institut Laue-Langevin
3 LMPC
Abstract : Neutron diffraction with isotopic substitution was carried out at room temperature on hydrated samples of Sm montmorillonite, prepared at pH = 4 and 8, in order to find out whether Sm is present as aqueous Sm(OH)3o, Sm3+, or intermediate hydrolyzed species, and how it is linked to the clay surface. It was found that the number of hydrogen atoms (5.5 ± 2.0) nearest to Sm3+ at pH = 4 is equal to or even slightly smaller than that of oxygen atoms (7.5 ± 1.0). This means that Sm3+ is bound to the clay surface and it is probably partially hydrolyzed. This result is very close to those obtained earlier for Yb3+ and Nd3+, despite the different methods of sample preparation and the different mineralogy of the samples.
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Contributor : Pascale Talour <>
Submitted on : Thursday, October 30, 2008 - 11:42:55 AM
Last modification on : Thursday, November 19, 2020 - 3:54:27 PM

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O. V. Sobolev, L. Charlet, G. J. Cuello, A. Gehin, J. Brendle, et al.. Hydration and hydrolysis of samarium (III) in montmorillonite clay: a neutron diffraction study. Journal of Physics: Condensed Matter, IOP Publishing, 2008, 20 (10, article n° 104207), pp.NIL_42-NIL_46. ⟨10.1088/0953-8984/20/10/104207⟩. ⟨insu-00335680⟩

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