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Related Experiment Videos

Ba-IV-type incommensurate crystal structure in group-V metals

McMahon1, Degtyareva, Nelmes

  • 1Department of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.

Physical Review Letters
|December 2, 2000
PubMed
Summary

The crystal structure of bismuth-III (Bi-III) was solved, revealing a composite structure with host and guest components. This structure was also identified in antimony-II (Sb-II) under high pressure.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • The high-pressure phases of bismuth (Bi) and antimony (Sb) have complex crystal structures that remain poorly understood.
  • Previous studies have indicated unique structural transitions in these elements under extreme conditions.

Purpose of the Study:

  • To determine the long-unknown crystal structure of bismuth-III (Bi-III).
  • To investigate the structural characteristics of antimony-II (Sb-II) under high pressure.
  • To compare the observed structures with those of other elements under similar conditions.

Main Methods:

  • Analysis of diffraction data to solve crystal structures.
  • Utilizing a composite structure model involving body-centered-tetragonal (bct) host and guest components.

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  • High-pressure experimentation and structural characterization.

    • Main Results:

    • The crystal structure of Bi-III was solved, revealing a composite structure consisting of a body-centered-tetragonal (bct) host and a bct guest component.
    • The guest component, composed of chains within the host's channels, is incommensurate with the host along the c-axis.
    • Diffraction data for antimony-II (Sb-II) confirmed it shares the same composite structure as Bi-III.
    • The determined structures bear resemblance to recently reported high-pressure phases in alkaline-earth metals like barium (Ba) and strontium (Sr).

    Conclusions:

    • The crystal structure of Bi-III is a composite type, featuring incommensurate host and guest components.
    • Antimony-II (Sb-II) exhibits a similar composite crystal structure under high pressure.
    • These findings highlight a shared structural motif in high-pressure phases of diverse elements, including post-transition metals and alkaline-earth metals.