First-principles study of structural, electronic, elastic and phonon properties of AB(2)O(4) (A = Ge, Si; B = Mg, Zn, Cd) spinel oxides


CANDAN A., UĞUR G.

MODERN PHYSICS LETTERS B, vol.30, no.3, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 3
  • Publication Date: 2016
  • Doi Number: 10.1142/s0217984916500020
  • Journal Name: MODERN PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Spinel oxides, band gap, elastic constants, phonon dispersion curves, LATTICE-DYNAMICS, RAMAN-SPECTRA, HIGH-PRESSURE, AB-INITIO, DENSITY, MG2SIO4, GAMMA-MG2SIO4, FORSTERITE, OLIVINE, MG2GEO4
  • Gazi University Affiliated: Yes

Abstract

The structural, electronic, elastic and phonon properties of the cubic spinels AB(2)O(4) (A = Ge, Si; B = Mg, Zn, Cd) compounds at zero pressure are investigated via density functional theory (DFT) using the Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional. It has been shown that the predicted values of the structural parameters (a(0) and u), bulk modulus (B), elastic constants (C-ij), shear modulus G and B/G ratio are in good agreement with the previously reported results. The phonon dispersion curves of the AB(2)O(4) (A = Ge, Si; B = Mg, Zn, Cd) are calculated for the first time using the direct method. The estimated phonon spectra indicate that GeMg2O4, GeZn2O4, GeCd2O4, SiMg2O4 and SiZn2O4 are dynamically stable in the cubic spinel structure.