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Related Experiment Videos

Novel chain structures in group VI elements.

Olga Degtyareva1, Eugene Gregoryanz, Maddury Somayazulu

  • 1Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, USA. o.degtyareva@gl.ciw.edu <o.degtyareva@gl.ciw.edu>

Nature Materials
|January 25, 2005
PubMed
Summary
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High-pressure X-ray diffraction reveals a new phase transition sequence for non-metallic sulfur. Only two stable phases, triangular and squared chain structures, exist between 1.5 and 83 GPa.

Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Advances in high-pressure techniques and X-ray crystallography enhance understanding of material phase diagrams.
  • Previously observed complex phases in alkali metals and modulated structures challenge conventional structural models.
  • The phase-transition sequence of non-metallic sulfur has been a long-standing, unresolved problem.

Purpose of the Study:

  • To resolve the phase-transition sequence of non-metallic sulfur under high pressure.
  • To characterize the stable phases and structural transformations of sulfur between 1.5 GPa and 83 GPa.
  • To compare sulfur's high-pressure structures with those of other group VI elements.

Main Methods:

  • Utilized advanced in situ X-ray diffraction techniques.

Related Experiment Videos

  • Applied high-pressure methods to synthesize and analyze material phases.
  • Investigated structural changes across a pressure range of 1.5 GPa to 83 GPa and temperatures from 300 K to 1,100 K.
  • Main Results:

    • The phase-transition sequence of non-metallic sulfur is significantly different from previous proposals.
    • Only two stable phases were identified: a triangular chain structure and a squared chain structure.
    • The squared chain structure observed in sulfur is also present in selenium.

    Conclusions:

    • The study redefines the understanding of sulfur's phase behavior under pressure.
    • High-pressure crystallography provides new insights into elemental structures.
    • Structural similarities between sulfur and selenium at high pressures are highlighted.