First-principles calculations of phonon and thermodynamic properties of Fe-Si compounds

Y. F. Liang, S. L. Shang, J. Wang, Y. Wang, F. Ye, J. P. Lin, G. L. Chen, Z. K. Liu

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

The phonon approach and the Debye model are combined to predict the vibrational thermodynamic contribution for the following Fe-Si compounds: Fe3Si, Fe2Si, Fe5Si3, FeSi, β-FeSi2 and α-FeSi2. Both the ultrasoft pseudopotential (USPP) and the projector augmented wave (PAW) methods are employed to describe the electron-ion interactions. The generalized gradient approximation including PW91 and PBE is employed to describe the exchange-correlation functional. Lattice parameters, bulk modulus, phonon dispersions, and finite temperature thermodynamic properties are calculated and compared with available experimental data, and good agreement is observed. The thermodynamic data obtained in the present work provide better understanding of the stability of binary Fe-Si compounds and can be used for further thermodynamic modeling of this system.

Original languageEnglish (US)
Pages (from-to)1374-1384
Number of pages11
JournalIntermetallics
Volume19
Issue number10
DOIs
StatePublished - Oct 2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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