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XRD investigation of the intercalation of nacrite with cesium chloride

Published online by Cambridge University Press:  02 January 2018

S. Naamen ,
N. Jâafar ,
H. Ben Rhaiem ,
A. Ben Haj Amara ,
A. Plançon  and
F. Muller
S. Naamen*
Affiliation:
LPNHM-Faculté des Sciences de Bizerte, Université de Carthage, Tunisia
N. Jâafar
Affiliation:
LPNHM-Faculté des Sciences de Bizerte, Université de Carthage, Tunisia
H. Ben Rhaiem
Affiliation:
LPNHM-Faculté des Sciences de Bizerte, Université de Carthage, Tunisia
A. Ben Haj Amara
Affiliation:
LPNHM-Faculté des Sciences de Bizerte, Université de Carthage, Tunisia
A. Plançon
Affiliation:
UFR Science Université d’Orléans, Orléans, France
F. Muller
Affiliation:
ISTO, CNRS-Université Orleans, 1A rue de la Ferrollerie, 45071 Orléans, Cedex 2, France
*
*E-mail: naasonia@yahoo.fr
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Abstract

An homogenous intercalated compound of dioctahedral 1:1 clay mineral with cesium chloride was prepared by immersing an homogeneous 8.4 Å hydrated nacrite in a CsCl-saturated solution. The nacrite/CsCl complex obtained was studied using X-ray diffraction and thermogravimetric analysis (TGA). The best agreement between the observed and the simulated ρ(z) (R = 7%) was obtained with one Cl− ion, one Cs+ ion and onewater molecule (per half-unit cell). The cation was located near the oxygen atom plane, while the anion was located near the hydroxyl groups of the adjacent layer. The number of the species intercalated in nacrite/CsCl was confirmed by TGA analysis. The best agreement between the calculated and the experimental hkl reflections, with h and/or k ≠ 0, corresponded to a stacking of 70% and 30% for T1 = −0.35a − 0.20b + 10.50n and T2 = +b/3 + 10.5n, respectively. These results indicate that the surface hydroxyls form hydrogen bonds with Cl− ions. The Cs+ ions are situated near the ditrigonal cavities of the tetrahedral sheet and they interact with the surface oxygen atoms whereas the H2O molecules interact with the intercalated species.

Keywords

intercalationnacritehydrated nacritenacrite/CsCl complexXRD
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 1 , March 2016 , pp. 29 - 38
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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