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Diverse surface reconstructions in MAX phases.

Mohammad Khazaei1,2, Mohammad Bagheri3,4, Ahmad Ranjbar5,6

  • 1Department of Physics, University of Tehran, North Kargar Ave., Tehran 14395-547, Iran. mohammad.khazaei@ut.ac.ir.

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|October 7, 2025
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Summary
This summary is machine-generated.

Surface reconstructions in MAX phases are complex, similar to semiconductors. Calculations reveal diverse reconstructions like buckling and Kagome lattices, driven by electronic properties and achieving dynamic stability.

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Area of Science:

  • Materials Science
  • Surface Science
  • Computational Materials Science

Background:

  • MAX phases, a class of transition metal carbides and nitrides, exhibit complex surface behavior.
  • Surface reconstructions in MAX phases are influenced by electronic and structural characteristics, akin to semiconductor surfaces.

Purpose of the Study:

  • To investigate surface reconstructions in MAX phases, particularly those involving A-element atoms in the topmost layer.
  • To explore the dynamic stability and electronic driving forces behind these surface phenomena.

Main Methods:

  • Utilized first-principles electronic and phonon calculations.
  • Analyzed various potential surface reconstructions, including hexagonal configurations, buckling, dimer/trimer formation, tetramers, pentagon chains, and Kagome lattices.

Main Results:

  • Identified MAX phases with dynamically stable hexagonal surface configurations (e.g., Ti2AlC, Ti2AlN).
  • Observed dynamic instability in other phases, leading to reconstructions like buckling (Ti2PbC), tetramers (Ti2SiC), and Kagome lattices (Ti2ZnC).
  • Reconstructed surfaces achieved dynamic stability, with energy gains from band splitting and electronic state rehybridization.

Conclusions:

  • Surface reconstructions in MAX phases are diverse and crucial for achieving dynamic stability.
  • Electronic interactions, including A-A orbital coupling and Fermi-level state rehybridization, drive these reconstructions.
  • The study highlights the intricate relationship between surface structure, electronic properties, and stability in MAX phases.