The effect of pressure on structural, electronic, elastic, vibration and optical properties of ScXSb (X=Ni, Pd, Pt) compounds

Kocak B., Ciftci Y.

Computational Condensed Matter, cilt.14, ss.176-185, 2018 (Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 14
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.cocom.2018.01.009
  • Dergi Adı: Computational Condensed Matter
  • Derginin Tarandığı İndeksler: Scopus
  • Sayfa Sayıları: ss.176-185
  • Anahtar Kelimeler: Elastic properties, Optical properties, Phonon dispersion curves, TOTAL-ENERGY CALCULATIONS, HALF-HEUSLER COMPOUNDS, AB-INITIO CALCULATIONS, THERMODYNAMIC PROPERTIES, CONSTANTS, AL, PHASES, HARD, SN, GE
  • Gazi Üniversitesi Adresli: Evet

Özet

© 2018 Elsevier B.V.The pressure dependence of the electronic, elastic, vibration and optical properties for ScXSb (X = Ni, Pd, Pt) half-Heusler compounds in cubic MgAgAs-type structure was systematically performed using the density functional theory with PAW method. The computed lattice parameters are in reasonable accord with available experimental data. Using the elastic constants and related parameters, the crystal rigidity and mechanical stability were discussed. The calculated electronic band structures revealed that ScNiSb and ScPdSb have an indirect gap in Γ-X Brillouin zone, whereas ScPtSb has a direct band gap in Γ-Γ Brillouin zone. We also presented phonon dispersion relation and density of phonon states. It is found that the considered structure is stable for three compounds between 0 and 50 GPa pressure. The optical properties were also predicted at various pressures.