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Journal of Superhard Materials

, Volume 41, Issue 5, pp 310–320 | Cite as

High Pressure Effects on Structural, Elastic and Thermodynamic Properties of Tantalum Mononitride

  • Jing ChangEmail author
  • Nina Ge
  • Ke Liu
  • Xu He
Production, Structure, Properties
  • 7 Downloads

Abstract

The pressure effects on the structural, elastic and thermodynamic properties of tantalum mononitride in WC-type phase (i.e. WC–TaN) are investigated by the first-principles plane wave pseudo-potential density functional theory method and the quasi-harmonic Debye model. The obtained equilibrium structure parameters and ground state properties are in excellent agreement with the experimental and other theoretical results. The calculations of the phonon dispersion curve and the density of phonon states verify that the WC–TaN is dynamically stable. A full elastic tensor and anisotropies behavior of the WC–TaN is also evaluated and discussed in the wide pressure range. The results show that WC–TaN is elastic anisotropy and mechanically stable up to 100 GPa, and the compression along c-axis direction is more difficult than along a-axis. The obtained superior mechanical properties show that WC–TaN is a promising candidate structure to be one of the ultra-incompressible and hard materials. Finally, by using the quasi-harmonic approximation model, we predicted the thermodynamic properties of WC–TaN under pressure and temperature. The heat capacity CV, Debye temperature θ, the thermal expansion α and the Grüneisen constant γ are obtained successfully in the ranges of 0–100 GPa and 0–2000 K.

Keywords

structural properties elastic properties thermodynamic properties first-principles high pressure 

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Notes

Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 11304211 and 11504304), the Construction Plan for Scientific research Innovation Team of Universities in Sichuan Province (No. 12TD008), the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials (Grant No. 15zxfk08).

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Copyright information

© Allerton Press, Inc. 2019

Authors and Affiliations

  1. 1.College of Physics and Electronic EngineeringSichuan Normal UniversityChengduChina
  2. 2.State Key Laboratory Cultivation Base for Nonmetal Composites and Functional MaterialsSouthwest University of Science and TechnologyMianyangChina
  3. 3.Chengdu Textile CollegeChengduChina

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