Structural, elastic, electronic and phonon properties of scandium-based compounds ScX3 (X = Ir, Pd, Pt and Rh): An ab initio study

Arikan N., Iyigor A., Candan A., Ugur Ş., Charifi Z., Baaziz H., ...Daha Fazla

COMPUTATIONAL MATERIALS SCIENCE, cilt.79, ss.703-709, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 79
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1016/j.commatsci.2013.07.041
  • Dergi Adı: COMPUTATIONAL MATERIALS SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.703-709
  • Anahtar Kelimeler: Elastic properties, Ab initio calculations, Density of states, Phonon, Ductility, RAY PHOTOELECTRON, BAND CALCULATION, 1ST-PRINCIPLES, METALS, SCPD3
  • Gazi Üniversitesi Adresli: Evet

Özet

Self-consistent band calculations on four compounds of the L1(2) structure are presented. The structural, elastic, electronic and phonon properties of ScX3 (X = Ir, Pd, Pt and Rh) compounds within density functional theory have been investigated. The calculated lattice constants for those compounds are in good agreement with the available theoretical and experimental values. The elastic constants (C-11, C-12 and C-44) in L1(2) phase for ScX3 (X = Ir, Pd, Pt and Pd) compounds are calculated using the energy-strain method. These calculated elastic constants satisfy the mechanical stability criterion and the ductility of ScX3 (X = Ir, Pd, Pt and Rh) is predicted by Pugh's criterion. The band structure and density of states (DOS), and phonon dispersion curves have been obtained and compared with the available results as well as with existing theoretical calculations. The present band structure calculations predict that the L1(2)-ScX3 (X = Ir, Pd, Pt and Pd) compounds are metals. Finally specific heat at constant volume versus temperature is calculated and discussed using the quasi harmonic approximation. (C) 2013 Elsevier B.V. All rights reserved.