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Related Experiment Videos

Complex crystal structure of cesium-III.

M I McMahon1, R J Nelmes, S Rekhi

  • 1Department of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom.

Physical Review Letters
|December 12, 2001
PubMed
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The crystal structure of Cesium-III (Cs-III) at high pressure was determined. Researchers discovered a complex orthorhombic structure, not the previously reported face-centered cubic form.

Area of Science:

  • Solid-state chemistry
  • Materials science
  • High-pressure physics

Background:

  • Previous studies reported a face-centered cubic (fcc) structure for Cesium-III (Cs-III) at high pressures.
  • The stability range of Cs-III was previously identified between 4.2 and 4.3 GPa at room temperature.

Purpose of the Study:

  • To determine the precise crystal structure of Cesium-III (Cs-III) under high-pressure conditions.
  • To verify or refute the previously reported fcc structure of Cs-III.

Main Methods:

  • Single-crystal X-ray diffraction was employed to analyze the structure of Cs-III.
  • Crystallographic data were collected and analyzed to determine the unit cell and space group.

Main Results:

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  • The study revealed a complex orthorhombic structure for Cs-III (space group C222(1)) with 84 atoms per unit cell.
  • No evidence supporting the previously reported fcc structure was found, even under conditions similar to prior experiments.

    • Conclusions:

    • The established structure of Cs-III is a novel orthorhombic type, distinct from the previously assumed fcc form.
    • This finding revises the understanding of elemental structures under high pressure and necessitates re-evaluation of prior Cesium phase diagrams.