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

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

doi:10.1154/1.1757448

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

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

Escuela Superior de Física y Matemáticas (ESFM)

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

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].

Original language	English
Pages (from-to)	284-291
Number of pages	8
Journal	Powder Diffraction
Volume	19
Issue number	3
DOIs	https://doi.org/10.1154/1.1757448
State	Published - Sep 2004

Keywords

Crystal structure
Ferricyanide
Ferrocyanide
Nickel hexacyanoferrates (II,III)
Rietveld

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

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, M{\"o}ssbauer 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 M{\"o}ssbauer spectra of the ferrous analogs, FeK2[Fe(CN)6] · xH2O and Fe[Pt(CN)6].",

keywords = "Crystal structure, Ferricyanide, Ferrocyanide, Nickel hexacyanoferrates (II,III), Rietveld",

author = "R. Mart{\'i}nez-Garcia and E. Reguera and J. Balmaseda and G. Ramos and H. Yee-Madeira",

year = "2004",

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doi = "10.1154/1.1757448",

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T1 - On the crystal structures of some nickel hexacyanoferrates (II,III)

AU - Martínez-Garcia, R.

AU - Reguera, E.

AU - Balmaseda, J.

AU - Ramos, G.

AU - Yee-Madeira, H.

PY - 2004/9

Y1 - 2004/9

N2 - 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].

AB - 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].

KW - Crystal structure

KW - Ferricyanide

KW - Ferrocyanide

KW - Nickel hexacyanoferrates (II,III)

KW - Rietveld

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U2 - 10.1154/1.1757448

DO - 10.1154/1.1757448

M3 - Artículo

SN - 0885-7156

VL - 19

SP - 284

EP - 291

JO - Powder Diffraction

JF - Powder Diffraction

IS - 3

ER -

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

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