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Issue 2, 2010
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Crystal structures and sodium/silver distributions within the ionic conductors Na5Ag2Fe3(As2O7)4 and Na2Ag5Fe3(P2O7)4

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Abstract

The crystal structures of new Na5Ag2Fe3(As2O7)4 and Na2Ag5Fe3(P2O7)4 compounds, prepared through ion exchange from Na7Fe3(X2O7)4 (X = P, As) are reported. They crystallize in the monoclinic C2/c space group and exhibit a Na/Ag ordering on cooling. Crystal structures were determined from single crystal X-ray diffraction at 100 and 298 K for each composition. The structure consists of FeO6 octahedra sharing their corners with X2O7 dimers (X = P, As) to form a three-dimensional framework [Fe3(X2O7)4]7− into which the sodium/silver ions are located. The differences between the four structures lie on the distribution of the sodium/silver ions within this framework giving a developed insight of the ionic diffusion paths.

Graphical abstract: Crystal structures and sodium/silver distributions within the ionic conductors Na5Ag2Fe3(As2O7)4 and Na2Ag5Fe3(P2O7)4

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The article was received on 21 Jul 2009, accepted on 03 Sep 2009 and first published on 24 Nov 2009


Article type: Paper
DOI: 10.1039/B9NJ00355J
Citation: New J. Chem., 2010,34, 287-293
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    Crystal structures and sodium/silver distributions within the ionic conductors Na5Ag2Fe3(As2O7)4 and Na2Ag5Fe3(P2O7)4

    E. Quarez, O. Mentré, K. Djellab and C. Masquelier, New J. Chem., 2010, 34, 287
    DOI: 10.1039/B9NJ00355J

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