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On the crystal structures of some nickel hexacyanoferrates (II,III)

Published online by Cambridge University Press:  06 March 2012

R. Martínez-Garcia
Affiliation:
Institute of Materials and Reagents, University of Havana, San Lázaro and L, 10400 Havana, Cuba
E. Reguera*
Affiliation:
Institute of Materials and Reagents, University of Havana, San Lázaro and L, 10400 Havana, Cuba
J. Balmaseda
Affiliation:
Institute of Materials and Reagents, University of Havana, San Lázaro and L, 10400 Havana, Cuba
G. Ramos
Affiliation:
Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada IPN, Unidad Qro. Col. Alameda, 76040 Querétaro, México
H. Yee-Madeira
Affiliation:
Depto. Física de la Escuela Superior de Física y Matemáticas-IPN, Col. Lindavista, México DF, México
*
a)Author to whom all correspondence should be addressed. Electronic mail: edilso@ff.oc.uh.cu
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Abstract

The crystal structures of some nickel hexacyanoferrates (II, III), including mixed compositions containing Na+, K+ and Cs+, were resolved and refined from XRD powder patterns. Data from infrared, Mössbauer and adsorption techniques provided complementary structural information. The crystal structures of Ni3[Fe(CN)6]2⋅16H2O and NiCs2[Fe(CN)6] were refined in space group Fm3m. NiNa2[Fe(CN)6]⋅2H2O and NiK2[Fe(CN)6]⋅2H2O were found to be orthorhombic (space group Pmn21). This structure (Pmn21) results from a distortion around the alkali ion, which appears as a monohydrated interstitial species. On ionic exchange in an aqueous solution containing Cs+, the orthorhombic distortion disappears and the cubic cell is obtained. Cs+ is a large cation and space is not available for interstitial water molecules. This orthorhombic model is also supported by the Mössbauer spectra of the ferrous analogs, FeK2[Fe(CN)6]⋅xH2O and Fe[Pt(CN)6]. © 2004 International Centre for Diffraction Data.

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Type
New Diffraction Data
Copyright
Copyright © Cambridge University Press 2004

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