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Structural transition in compressed amorphous sulfur.

Chrystèle Sanloup1, Eugene Gregoryanz, Olga Degtyareva

  • 1School of Geosciences and Center for Science at Extreme Conditions, University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ, United Kingdom. chrystele.sanloup@ed.ac.uk

Physical Review Letters
|March 21, 2008
PubMed
Summary
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Amorphous sulfur (a-S) transforms into a denser form above 65 GPa, revealing an amorphous-amorphous transition. This study enables density measurements of liquid-amorphous materials under extreme pressure conditions.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • High-Pressure Science

Background:

  • Amorphous sulfur (a-S) exhibits unique properties under varying conditions.
  • Understanding the structural behavior of amorphous materials at high pressures is crucial.

Purpose of the Study:

  • To investigate the structural properties and phase transitions of amorphous sulfur (a-S) under extreme pressures.
  • To determine the density changes associated with structural transformations in a-S.

Main Methods:

  • Synchrotron X-ray diffraction was employed to probe the structure of a-S.
  • Experiments were conducted at pressures up to 100 GPa and temperatures between 40 and 175 K.
  • Analysis of the structure factor provided the radial distribution function and densities.

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Main Results:

  • Amorphous sulfur undergoes a significant structural transition at pressures above 65 GPa.
  • A density discontinuity of 7% was observed during this transition.
  • Two distinct amorphous forms, a low-density and a high-density form, were identified.

Conclusions:

  • The study confirms an amorphous-amorphous phase transition in sulfur under high pressure.
  • These findings pave the way for direct density measurements of liquid-amorphous materials at extreme conditions.
  • The research contributes to the understanding of material behavior under high-pressure environments.