First-Principles Study on the MAX Phases Tin+1GaNn (n=1,2, and 3)

Sürücü G., Colakoglu K., Deligöz E., Körözlü N.

JOURNAL OF ELECTRONIC MATERIALS, vol.45, no.8, pp.4256-4264, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 45 Issue: 8
  • Publication Date: 2016
  • Doi Number: 10.1007/s11664-016-4607-1
  • Journal Name: JOURNAL OF ELECTRONIC MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4256-4264
  • Keywords: MAX phases, electronic properties, phonons, mechanical properties, first-principles, M(N+1)AX(N) PHASES, STABILITY, DYNAMICS
  • Gazi University Affiliated: Yes

Abstract

We have performed first-principles density functional theory calculations within generalized-gradient approximation to obtain the structural, mechanical, electronic, and dynamic properties of Tin+1GaNn compounds. In order to examine the stability of these compounds, formation enthalpies, single-crystal elastic constants, and phonon dispersion curves were calculated. We show that all compounds are stable, while alpha-Ti4GaN3 is the most stable. The density of states calculations also demonstrate that all of the compounds are metallic. Additionally, bonding nature and related characteristics such as Mulliken atomic charges and bond overlap populations were investigated. Furthermore, thermodynamic properties were calculated by means of phonon dispersion curves. The results are compared in this work with available experimental values and theoretical calculations.