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Modeling of amorphous carbon structures with arbitrary structural constraints.

F H Jornada1, V Gava, A L Martinotto

  • 1Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre-RS, Brazil.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 16, 2011
PubMed
Summary

Researchers developed a new method to create amorphous carbon structures with varied bonding. The study reveals how mean coordination influences bulk modulus, offering insights into material properties.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Condensed Matter Physics

Background:

  • Generating amorphous structures with specific properties is challenging.
  • Understanding structure-property relationships in amorphous materials is crucial for technological applications.

Purpose of the Study:

  • To present a novel computational method for generating amorphous structures with arbitrary constraints.
  • To investigate the relationship between the mean coordination number and the bulk modulus of amorphous carbon.
  • To explore the impact of varying hybridization states (sp, sp2, sp3) on material properties.

Main Methods:

  • Utilized the simulated annealing algorithm to minimize a tailored cost function.
  • The cost function incorporates energy terms and coordination penalties.
  • Calculated bulk moduli using Brenner's potential for generated amorphous carbon structures.

Main Results:

  • Generated amorphous carbon structures with diverse sp, sp2, and sp3 hybridization combinations.
  • Established a strong power-law dependence of bulk modulus on mean coordination (ν = 1.51 ± 0.17).
  • A modified cost function showed that segregating hybridizations weakens the bulk modulus-coordination correlation.

Conclusions:

  • The developed method effectively generates amorphous structures with controlled properties.
  • Mean coordination is a key factor governing the bulk modulus of amorphous carbon.
  • The methodology can be extended to study other factors like hydrogen incorporation and defects.