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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Boron-based compounds are recognized for hardness and superconductivity.
  • Tetragonal metal borides LiB4 and NaB4 were previously synthesized under high pressure.
  • Their properties at ambient pressure remain largely unexplored.

Purpose of the Study:

  • To investigate the mechanical and superconducting properties of LiB4 and NaB4 at ambient pressure.
  • To explore the potential of these materials as superhard and superconducting substances.

Main Methods:

  • First-principles calculations were employed to study I4/mmm-structured LiB4 and NaB4.
  • Vickers hardness was calculated.
  • Electron-phonon coupling was analyzed to determine superconducting properties.

Main Results:

  • Both LiB4 and NaB4 exhibit high Vickers hardness (39 GPa) due to a robust boron framework.
  • These materials demonstrate significant stability, indicating potential as superhard materials.
  • Phonon-mediated superconductivity was predicted with critical temperatures of 6 K for LiB4 and 8 K for NaB4 at 1 atm.

Conclusions:

  • LiB4 and NaB4 are promising candidates for superhard materials owing to their high hardness and stability.
  • Their predicted superconducting properties contribute to understanding metal boride functionalities.
  • This research encourages further exploration of novel borides with combined mechanical and superconducting characteristics.