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

被引:16
作者
Martínez-Garcia, R
Reguera, E [1 ]
Balmaseda, J
Ramos, G
Yee-Madeira, H
机构
[1] Univ Havana, Inst Mat & Reagents, Havana 10400, Cuba
[2] IPN, Ctr Invest Ciencia Aplicada & Tecnol Avanzada, Unidad Qro, Queretaro 76040, Mexico
[3] IPN, Escuela Super Fis & Matemat, Depto Fis, Mexico City 07738, DF, Mexico
关键词
nickel hexacyanoferrates (II; III); crystal structure; ferrocyanide; ferricyanide; Rietveld;
D O I
10.1154/1.1757448
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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, Mossbauer and adsorption techniques provided complementary structural information. The crystal structures of Ni-3[Fe(CN)(6)](2)center dot 16H(2)O and NiCS2[Fe(CN)(6)] were refined in space group Fm3m. NiNa2[Fe(CN)(6)]center dot 2H(2)O and NiK2[Fe(CN)(6)]center dot 2H(2)O 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 Mossbauer spectra of the ferrous analogs, FeK2[Fe(CN)(6)]center dot xH(2)O and Fe[Pt(CN)(6)]. (c) 2004 International Centre for Diffraction Data.
引用
收藏
页码:284 / 291
页数:8
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