On the crystal structures of some nickel hexacyanoferrates II,III
The crystal structures of some nickel hexacyanoferrates ~II, III!, including mixed compositions containing Na1, K1 and Cs1, were resolved and refined from XRD powder patterns. Data from infrared, Mo¨ssbauer and adsorption techniques provided complementary structural information. The crystal structur...
| Autores: | , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2004 |
| País: | México |
| Recursos: | Instituto Politécnico Nacional |
| Repositorio: | Repositorio Digital del IPN |
| OAI Identifier: | oai:www.repositoriodigital.ipn.mx:123456789/11533 |
| Acesso em linha: | http://hdl.handle.net/123456789/1087 http://www.repositoriodigital.ipn.mx/handle/123456789/11533 |
| Access Level: | acceso abierto |
| Palavra-chave: | nickel hexacyanoferrates ~II,III! Rietveld crystal structure ferrocyanide ferricyanide |
| Resumo: | The crystal structures of some nickel hexacyanoferrates ~II, III!, including mixed compositions containing Na1, K1 and Cs1, were resolved and refined from XRD powder patterns. Data from infrared, Mo¨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 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 Cs1, the orthorhombic distortion disappears and the cubic cell is obtained. Cs1 is a large cation and space is not available for interstitial water molecules. This orthorhombic model is also supported by the Mo¨ssbauer spectra of the ferrous analogs, FeK2@Fe(CN)6# xH2O and Fe@Pt(CN)6#. © 2004 International Centre for Diffraction Data. @DOI: 10.1154/1.1757448# |
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