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Related Experiment Videos

Cluster configurations in modulated EuVxMo8+/-yO14 crystals.

Leligny1, Grebille, Roussel

  • 1Laboratoire CRISMAT (UMR CNRS 6508), ISMRA, 14050 Caen CEDEX, France. h.leligny@crismat.ismra.fr

Acta Crystallographica. Section B, Structural Science
|August 6, 2000
PubMed
Summary

Europium-vanadium-molybdenum oxide crystals exhibit one-dimensional incommensurate modulations and form novel metallic clusters. These structures reveal strong intercluster bonding within layers and between them.

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Area of Science:

  • Solid State Chemistry
  • Crystallography
  • Materials Science

Background:

  • Orthorhombic crystals of the formula Eu(x)V(y)Mo(8+/-z)O(14) were studied.
  • These crystals share similar lattice parameters and exhibit one-dimensional incommensurate modulations.
  • Their structures are related to known lanthanum-molybdenum oxides but with key differences in modulation direction and symmetry.

Purpose of the Study:

  • To investigate the crystallographic and structural properties of Eu(x)V(y)Mo(8+/-z)O(14) crystals.
  • To characterize the nature of metallic clusters and intercluster bonding within these materials.
  • To compare the structural features with related lanthanum-molybdenum oxide systems.

Main Methods:

  • X-ray diffraction using Mo Kalpha radiation (lambda = 0.71073 Å).

Related Experiment Videos

  • Analysis of crystal compositions and lattice parameters.
  • Superspace group determination and modulation vector analysis.

    • Main Results:

    • Three distinct compositions of Eu(x)V(y)Mo(8+/-z)O(14) were identified with varying gamma components.
    • The crystals display one-dimensional incommensurate modulations along the c-axis with superspace group Cmca(00gamma)s00.
    • Novel metallic clusters (e.g., Mo(9), Mo(10), Mo(6)V(4)) were discovered, alongside known types, with strong intercluster Mo-Mo, Mo-V, and V-V bonds (~2.6 Å).

    Conclusions:

    • The Eu-containing crystals possess centrosymmetric structures, contrasting with the polar structures of modulated La-containing analogs.
    • The stacking of Mo/V atoms forms (001) layers of metallic clusters, with variations in cluster type and configuration along the c-axis.
    • The study highlights the formation of significant intercluster bonding, contributing to the overall structural integrity and properties of these oxide materials.