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Nd(2)(WO(4))(3).

Matthias Weil, Berthold Stöger, Lyubomir Aleksandrov

    Acta Crystallographica. Section E, Structure Reports Online
    |May 18, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Dineodymium(III) tris-[tungstate(VI)] crystallizes in a rare earth tungstate structure, derived from scheelite. This study details its unique crystal structure with distorted polyhedra and W(2)O(8) dimers.

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    Area of Science:

    • Inorganic Chemistry
    • Solid-State Chemistry
    • Crystallography

    Background:

    • The Eu(2)(WO(4))(3) structure type is known for rare earth tungstates and molybdates.
    • Scheelite (CaWO(4)) is a foundational structure in inorganic materials.
    • Understanding rare earth tungstate structures is crucial for materials science applications.

    Purpose of the Study:

    • To elucidate the crystal structure of dineodymium(III) tris-[tungstate(VI)].
    • To analyze the coordination environments of neodymium and tungsten cations.
    • To describe the structural relationships with the scheelite and Eu(2)(WO(4))(3) families.

    Main Methods:

    • Single-crystal X-ray diffraction analysis.
    • Structural characterization and comparison with related compounds.
    • Coordination geometry analysis of cations and polyhedra.

    Main Results:

    • Dineodymium(III) tris-[tungstate(VI)] crystallizes isotypically within the Eu(2)(WO(4))(3) family.
    • The structure is an ordered defect variant of scheelite with an unoccupied rare earth site.
    • Neodymium cations exhibit distorted bicapped trigonal prismatic coordination (NdO(8)).
    • Tungsten cations are tetrahedrally coordinated (WO(4)), with one tetrahedron exhibiting a distorted WO(4+1) geometry due to an additional oxygen.
    • WO(4) and WO(4+1) polyhedra form W(2)O(8) dimers via edge-sharing.

    Conclusions:

    • The detailed crystal structure of dineodymium(III) tris-[tungstate(VI)] has been determined.
    • The compound exhibits a unique structural motif involving distorted tungstate polyhedra and W(2)O(8) dimers.
    • This work contributes to the understanding of rare earth tungstate structures and their relation to the scheelite framework.