Lattice vibrational properties of Al2X (X = Sc, Y) from density functional theory calculations

Deligoz E., Colakoglu K., Ozisik H. B. , Ciftci Y.

SOLID STATE COMMUNICATIONS, cilt.152, sa.2, ss.76-80, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 152 Konu: 2
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.ssc.2011.10.041
  • Dergi Adı: SOLID STATE COMMUNICATIONS
  • Sayfa Sayıları: ss.76-80

Özet

The phonon dispersion curves of the C15-type of Al2Sc and Al2Y compounds are investigated, using density functional theory within the generalized gradient approximation (GGA), based on the "direct method". The obtained results show that both compounds are dynamically stable. The temperature dependence of the various thermodynamical quantities such as internal energy, free energy, entropy, and heat capacity are also predicted under the harmonic approximation, and the observed trends are discussed in detail. (C) 2011 Elsevier Ltd. All rights reserved.