The structural, electronic, elastic, vibration and thermodynamic properties of GdMg

Mogulkoc Y., ÇİFTCİ Y., Colakoglu K., Deligoz E.

Solid State Sciences, vol.16, pp.168-174, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 16
  • Publication Date: 2013
  • Doi Number: 10.1016/j.solidstatesciences.2012.10.014
  • Journal Name: Solid State Sciences
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.168-174
  • Keywords: Ab-initio calculations, Structural properties, Electronic properties, Elastic properties, Thermodynamic properties, GdMg, VASP, TOTAL-ENERGY CALCULATIONS, AB-INITIO CALCULATIONS, PHASE-STABILITY, B2-MGRE RE, MG, 1ST-PRINCIPLES, CONSTANTS, TRANSITION, ALLOYS, SC
  • Ankara University Affiliated: Yes

Abstract

We have investigated the structural, elastic, electronic, vibration and thermodynamic properties of GdMg alloy using the methods of density functional theory within the generalized gradient approximation (GGA) for the exchange-correlation functional. We have presented the results on the basic physical parameters, such as the lattice constant, bulk modulus, pressure derivative of bulk modulus with and without spin-polarization (SP), second-order elastic constants, Zener anisotropy factor, Poisson's ratio, Young's modulus, and isotropic shear modulus. The thermodynamic properties of the considered compound are obtained through the quasi-harmonic Debye model. In order to obtain further information, we have also studied the pressure and temperature- dependent behavior of the volume, bulk modulus, thermal expansion coefficient, heat capacity, and Debye temperature in a wide temperature range of 0-1200 K. We have also calculated phonon frequencies and one-phonon density of states for B2 structure of GdMg compound. The temperature-dependent behavior of heat capacity and entropy obtained from phonon density of states for GdMg compound in B2 phase is also presented. © 2012 Elsevier Masson SAS. All rights reserved.