Na7Fe4(PO4)6: a mixed-valence iron phosphate containing a tetramer of edge-sharing FeO6 octahedra
- 1 January 1996
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 6,p. 819-822
- https://doi.org/10.1039/dt9960000819
Abstract
A novel mixed-valence iron phosphate, Na7Fe4(PO4)6, has been synthesized by a high-temperature, high-pressure hydrothermal method and characterized by single-crystal X-ray diffraction and Mössbauer spectroscopy. The compound crystallizes in the trigonal space group Rc with a= 13.392(2), c= 17.858(3)Å, U= 2773.7(8)Å3, Z= 6 and R= 0.0179. The structure consists of tetrameric units of edge-sharing FeO6 octahedra, which are connected by corner-sharing PO4 tetrahedra to form a three-dimensional framework structure, enclosing a network of cavities where the sodium cations reside. Mössbauer spectroscopy supports the presence of one FeII and three FeIII in a tetrameric unit.Keywords
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