The Physics of Metals and Metallography

, Volume 116, Issue 10, pp 1015–1028 | Cite as

Structure and properties of nanostructured NbN and Nb-Si-N films depending on the conditions of deposition: Experiment and theory

  • V. I. Ivashchenko
  • P. L. Skrynskii
  • O. S. Litvin
  • A. D. Pogrebnjak
  • V. N. Rogoz
  • G. Abadias
  • O. V. Sobol’
  • A. P. Kuz’menko
Structure, Phase Transformations, and Diffusion

Abstract

The first results of studying the phase–structural state, properties, sizes of nanograins, hardness, and microstresses in nanocomposite NbN and Nb-Si-N films are given. The investigated films were obtained by the method of the magnetron sputtering of Nb and Si targets onto silicon substrates at different negative potentials at the substrate (from 0 to–70 V), nitrogen pressures PN, and discharge powers at the targets. To determine the thermal stability of the films, they were annealed at 600, 800, and 1000°C in a vacuum. It was revealed for the first time that the NbN films have a two-phase nanocomposite structure, which consists of δ-NbN (NaCl structure type) and α'-NbN. The δ-NbN phase is also formed in Nb-Si-N films, where it is enveloped by an amorphous Si3N4 phase The hardness of the Nb-Si-N films reaches 46 GPa, which corresponds to the level of superhardness, while the hardness of the NbN nanocomposites is somewhat lower, but also very high (34 GPa). The experimental results for the Nb-Si-N films were explained based on the data obtained from the first-principles calculations of the NbN/SixNy heterostructures by the moleculardynamics method.

Keywords

NbN Nb-Si-N molecular dynamics superhardness nanocomposite 

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Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  • V. I. Ivashchenko
    • 1
  • P. L. Skrynskii
    • 1
  • O. S. Litvin
    • 2
  • A. D. Pogrebnjak
    • 3
  • V. N. Rogoz
    • 3
  • G. Abadias
    • 4
  • O. V. Sobol’
    • 5
  • A. P. Kuz’menko
    • 6
  1. 1.Institute of Problems of Materials ScienceNational Academy of Sciences of UkraineKievUkraine
  2. 2.Institute of Physics of SemiconductorsNational Academy of Sciences of UkraineKievUkraine
  3. 3.Sumy State University, 40000 SumySumyUkraine
  4. 4.Institut PPoitiersFrance
  5. 5.Kharkov Polytechnical Institute National Technical UniversityKharkovUkraine
  6. 6.Kursk State Technical UniversityKnowledge-Intensive Technologies Center of Collaborative AccessKurskRussia

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