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Crystal structures of some manganese(II) and cadmium hexacyanoferrates (II,III) and structural transformations related to the sorption of Cesium

Published online by Cambridge University Press:  06 March 2012

R. Martínez-García ,
E. Reguera ,
J. Rodriguez ,
J. Balmaseda  and
J. Roque
R. Martínez-García
Affiliation:
Institute of Materials and Reagents, University of Havana, 10400 Havana, Cuba
E. Reguera*
Affiliation:
Institute of Materials and Reagents, University of Havana, 10400 Havana, Cuba
J. Rodriguez
Affiliation:
Institute of Materials and Reagents, University of Havana, 10400 Havana, Cuba
J. Balmaseda
Affiliation:
Institute of Materials and Reagents, University of Havana, 10400 Havana, Cuba
J. Roque
Affiliation:
Institute of Materials and Reagents, University of Havana, 10400 Havana, Cuba
*
a)Author to whom correspondence should be addressed; Electronic mail: [email protected]
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Abstract

Mn2+ and Cd2+ form a family of isostructural hexacyanoferrates(II,III). Their crystal structures, including those of mixed compositions containing K+ and Cs+ as charge balance cations, were resolved and refined from XRD powder patterns. The crystal structures of M3[Fe(CN)6]2⋅xH2O and MCs2[Fe(CN)6] (where M=Mn, Cd) were refined in the space group Fm3m. The mixed salts, MK2[Fe(CN)6]⋅2H2O, were found to be orthorhombic (space group Pmn21). The orthorhombic structure results from a local distortion due to monohydrated potassium ions located in interstitial sites. On ionic exchange in an aqueous solution containing Cs+, the orthorhombic distortion disappears and the cubic cell is obtained. Cs+ is a large ion, which practically fills the available interstitial voids stabilizing the cubic structure. In solutions of K+ and Cs+ the single salts, M2[Fe(CN)6]⋅8H2O (monoclinic P21/n) also transform, in this case liberating M2+ ions and forming the corresponding mixed salts. An analogous but slow structural transformation was also observed in the anhydrous forms of these single salts. These structural transformations could be relevant to the use of these compounds as ion exchangers and particularly for the sorption of 137Cs+ from radioactive waste solutions. The XRD data were complemented with structural information from infrared (IR), Mössbauer and water vapor adsorption techniques. © 2004 International Centre for Diffraction Data.

Keywords

manganese hexacyanoferrates(II,III)cadmium hexacyanoferrates(II,III)crystal structureferrocyanideferricyanideRietveldMössbauerionic exchange
Type
Technical Articles
Information
Powder Diffraction , Volume 19 , Issue 3 , September 2004 , pp. 255 - 264
Copyright
Copyright © Cambridge University Press 2004

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