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Superhard Pseudocubic BC2N superlattices.

Shiyou Chen1, X G Gong, Su-Huai Wei

  • 1Surface Science Laboratory (National Key) and Physics Department, Fudan University, Shanghai, China.

Physical Review Letters
|March 16, 2007
PubMed
Summary
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Diamondlike BC2N materials are harder than cubic boron nitride (c-BN). Our study identified new superlattice structures, confirming experimental findings on the superior hardness of boron-carbonitrides.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Computational Materials Design

Background:

  • The relative hardness of diamondlike boron carbonitrides (BC2N) compared to cubic boron nitride (c-BN) is a subject of ongoing scientific debate.
  • Previous theoretical studies have yielded conflicting results regarding the hardness of BC2N.

Purpose of the Study:

  • To investigate the hardness of diamondlike BC2N compared to c-BN.
  • To identify stable and low-energy structures of BC2N using computational methods.

Main Methods:

  • Employed the bond counting rule for an unconstrained search of potential BC2N structures.
  • Identified and analyzed short-period (111) superlattices with significantly lower total energies than previously reported.
  • Calculated the ideal strength of these pseudocubic boron-carbonitrides.

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Main Results:

  • Discovered a series of stable BC2N superlattice structures with lower total energies.
  • Demonstrated that these identified BC2N structures exhibit superior hardness compared to c-BN.
  • Results align with experimental observations but contradict a recent theoretical claim.

Conclusions:

  • The study provides strong evidence that certain BC2N structures are harder than c-BN.
  • The findings resolve discrepancies between theoretical predictions and experimental data on BC2N hardness.
  • Highlights the importance of exploring diverse structural configurations in materials discovery.