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Related Experiment Videos

Electron channeling X-ray microanalysis for partially filled skutterudite structure.

Takao Morimura1, Masayuki Hasaka

  • 1Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan. tmori@net.nagasaki-u.ac.jp

Micron (Oxford, England : 1993)
|June 7, 2005
PubMed
Summary

Atomic location by channeling enhanced microanalysis (ALCHEMI) determined Ce atom occupancy and Sb atom positions in skutterudite CeFe6Ni2Sb24. This research provides precise atomic structural data for this thermoelectric material.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Skutterudites are a class of materials with potential thermoelectric properties.
  • Accurate determination of atomic structure is crucial for understanding and optimizing material properties.
  • CeFe6Ni2Sb24 is a partially filled skutterudite with potential applications.

Purpose of the Study:

  • To determine the occupancy of Cerium (Ce) atoms on void sites.
  • To precisely determine the coordinates of Antimony (Sb) atoms.
  • To refine the understanding of the atomic structure of CeFe6Ni2Sb24.

Main Methods:

  • Utilized Atomic Location by Channeling Enhanced Microanalysis (ALCHEMI).
  • Measured and calculated characteristic X-ray intensities under various electron incidence directions in a transmission electron microscope.

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  • Employed dynamical electron diffraction and inelastic scattering theories for calculations.
  • Applied the Levenberg-Marquardt least squares method for data fitting.

    • Main Results:

    • The occupation probability of Ce atoms on void sites was determined to be 0.33.
    • The coordinates of Sb atoms were found to be (0, 0.336, 0.147).
    • Calculated X-ray intensities showed significant dependence on Ce occupancy, Sb coordinates, and sample thickness.

    Conclusions:

    • The study successfully determined the atomic structure of CeFe6Ni2Sb24 using ALCHEMI.
    • Precise atomic site occupancy and coordinates were established for Ce and Sb atoms.
    • The findings contribute to the detailed structural characterization of skutterudite materials.