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

R. Martínez-Garcia, E. Reguera, J. Balmaseda, G. Ramos, H. Yee-Madeira

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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 Pmn2 1). 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.
Original languageAmerican English
Pages (from-to)284-291
Number of pages254
JournalPowder Diffraction
DOIs
StatePublished - 1 Sep 2004

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Nickel
Crystal structure
nickel
crystal structure
interstitials
Alkalies
Powders
Cations
Ion exchange
Diffraction
Positive ions
Ions
Infrared radiation
Adsorption
Molecules
Water
alkalies
Chemical analysis
analogs
aqueous solutions

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Martínez-Garcia, R. ; Reguera, E. ; Balmaseda, J. ; Ramos, G. ; Yee-Madeira, H. / On the crystal structures of some nickel hexacyanoferrates (II,III). In: Powder Diffraction. 2004 ; pp. 284-291.
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On the crystal structures of some nickel hexacyanoferrates (II,III). / Martínez-Garcia, R.; Reguera, E.; Balmaseda, J.; Ramos, G.; Yee-Madeira, H.

In: Powder Diffraction, 01.09.2004, p. 284-291.

Research output: Contribution to journalArticleResearchpeer-review

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