Structure and stability of transition metal nitride interfaces from first-principles: AlN/VN, AlN/TiN, and VN/TiN

C. Stampfl, A. J. Freeman

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We perform first-principle density-functional theory calculations using the full-potential linearized augmented plane wave method to investigate the formation, atomic and electronic structure, and stability of the metal-nitride interface systems, (1 0 0) AlN/TiN, AlN/VN, and VN/TiN in the rocksalt structure. We also determine the surface, interface, and strain energies, of the constituent materials, as well as the layer-dependent interaction energy between the adlayer surface and the interface. We find that this latter interaction, while typically not taken into account, plays an important role in terms of the formation energy for the initial stages of film growth. Using these energy quantities we calculate the film formation energy as a function of thicknesses, where we find that the growth of TiN on VN has the lowest formation energy, followed respectively by AlN on VN, and AlN on TiN. The formation energy of the latter two systems is notably higher due to the significantly higher energy of the metastable rocksalt phase of AlN compared to the stable wurtzite structure. From our calculations, together with experiment, we can predict the values of the interface energy of wurtzite-AlN on VN(1 0 0) and TiN(1 0 0).

Original languageEnglish
Pages (from-to)5638-5645
Number of pages8
JournalApplied Surface Science
Volume258
Issue number15
DOIs
Publication statusPublished - May 15 2012

Keywords

  • Atomic structure
  • Density functional theory
  • Hard coatings
  • Interface energy
  • Metal nitrides
  • Nanostructured materials

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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