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Researchers discovered a new crystal phase of selenium under extreme pressure. This phase exhibits unusual negative linear compressibility, challenging previous understandings of material behavior under high pressure.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Studying chemical elements under extreme pressure conditions can yield unexpected structural properties.
  • Selenium's behavior under ultra-high pressure has not been fully characterized.

Purpose of the Study:

  • To investigate the crystal structure of selenium under ultra-high pressure.
  • To identify novel phases and properties of selenium at extreme conditions.

Main Methods:

  • High-pressure synthesis and structural analysis.
  • X-ray diffraction techniques to determine crystal structure.

Main Results:

  • A new crystal phase of selenium was identified at ultra-high pressures.
  • This novel phase exhibits negative linear compressibility (NLC).
  • NLC is a rare phenomenon where a material contracts in one direction while expanding in others under compression.

Conclusions:

  • The discovery of a new selenium phase with NLC expands the understanding of material behavior under extreme pressure.
  • This finding highlights the potential for discovering exotic properties in elements subjected to high-pressure conditions.