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ChemInform Abstract: Layered Iron(III) Arsenates: Synthesis and Characterization of M2Fe2O( AsO4)2 (M: K, Rb).

✍ Scribed by R.-S. CHANG; S.-L. WANG; K.-H. LII

Publisher: John Wiley and Sons
Year: 2010
Weight: 29 KB
Volume: 28
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199742023

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✦ Synopsis

Layered Iron(III) Arsenates: Synthesis and Characterization of M2Fe2O( AsO4)2 (M: K, Rb).

-Red crystals of the title compounds are prepared by reaction of MH2AsO4 (M: K, Rb) and Fe2O3 at 700-800 • C and characterized by single-crystal XRD, Moessbauer spectroscopy, and magnetic susceptibility measurements. The isostructural compounds (orthorhombic, Pnma, Z = 4) are built-up from slabs of edge-sharing FeO6 octahedra which are linked by AsO4 tetrahedra forming a layer structure with alkali metal cations in the interlayer space. In the compounds iron exists in the three-valent state only. Susceptibility measurements for Rb2Fe2O(AsO4)2 show a transition to weak ferromagnetism near 25 K.

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