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Related Experiment Videos

XAFS study on liquid selenium under high pressure.

Y Katayama1

  • 1Japan Atomic Energy Research Institute, Sayo, Hyogo, Japan. katayama@spring8.or.jp

Journal of Synchrotron Radiation
|August 22, 2001
PubMed
Summary
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High-pressure studies reveal that selenium

Area of Science:

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

Background:

  • Selenium (Se) exists as infinite chain molecules in crystalline form.
  • Melting of Se at atmospheric pressure largely preserves its chain structure.
  • Understanding Se's structural behavior under extreme conditions is crucial.

Purpose of the Study:

  • To investigate the structural transformations of selenium (Se) under high pressure and temperature.
  • To determine the state of covalent bonds in liquid Se at elevated pressures.
  • To explore the relationship between structural changes and potential semiconductor-metal transitions.

Main Methods:

  • X-ray absorption fine structure (XAFS) spectroscopy was employed.
  • Measurements were conducted using large-volume presses.

Related Experiment Videos

  • XAFS spectra were obtained for crystalline and liquid Se at temperatures up to 1173 K and pressures up to 8 GPa.

    • Main Results:

    • At 2.5 GPa, twofold covalent bonds in Se persist upon melting.
    • At 8 GPa, melting leads to a significant modification of covalent bonds, exceeding crystalline state's temperature dependence.
    • EXAFS oscillation changes indicate structural alterations in liquid Se at high pressure.

    Conclusions:

    • Selenium's covalent bonding is pressure-dependent, with modifications observed at 8 GPa.
    • Structural changes in liquid Se suggest a transition influenced by high pressure.
    • The study provides insights into Se's behavior concerning high-pressure semiconductor-metal transitions.