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Related Experiment Videos

Liquid alumina: detailed atomic coordination determined from neutron diffraction data using empirical potential

C Landron1, L Hennet, T E Jenkins

  • 1Centre de Recherches sur les Matériaux à Haute Température, 45071, Orléans Cedex 2, France.

Physical Review Letters
|June 1, 2001
PubMed
Summary

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This study measured the neutron scattering structure factor of molten alumina for the first time. Liquid alumina primarily features 4-fold coordinated aluminum sites, with some 5-fold coordination present.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Inorganic Chemistry

Background:

  • Understanding the structure of molten oxides is crucial for various industrial processes.
  • Previous studies on liquid alumina structure have been limited.
  • High-temperature molten alumina presents experimental challenges.

Purpose of the Study:

  • To determine the neutron scattering structure factor S(N)(Q) of molten alumina.
  • To model the atomic structure of liquid alumina using experimental data.
  • To investigate the coordination of aluminum and oxygen atoms in molten alumina.

Main Methods:

  • Laser-heated aerodynamic levitation furnace for sample containment at high temperatures.
  • Neutron scattering experiments to measure the structure factor S(N)(Q).

Related Experiment Videos

  • Empirical potential structural refinement technique for atomic model generation.

    • Main Results:

    • First measurement of the neutron scattering structure factor S(N)(Q) for molten alumina at 2500 K.
    • Generated a 1700-atom model of liquid alumina.
    • Approximately 62% of aluminum sites are 4-fold coordinated, with 24% being 5-fold coordinated.
    • Octahedral aluminum sites, common in crystalline alumina, are rare (2%) in the liquid state.

    Conclusions:

    • The local atomic structure of molten alumina differs significantly from its crystalline counterpart.
    • The prevalence of 4-fold and 5-fold coordinated aluminum sites dictates the liquid structure.
    • These findings provide fundamental insights into the behavior of molten alumina at extreme temperatures.