Quasiharmonic calculations of thermodynamic properties for La3−xTe4 system

Yi Wang, Yong Jie Hu, Xiaoyu Chong, Jorge Paz Soldan Palma, Samad A. Firdosy, Kurt E. Star, Jean Pierre Fleurial, Vilupanur A. Ravi, Shun Li Shang, Long Qing Chen, Zi Kui Liu

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Abstract

An extensive first-principles quasiharmonic phonon calculation was carried out for the thermoelectric material La3−xTe4 at the compositions of x = 0.0, 0.25 and 0.33, focusing at the La site vacancy effects on the thermodynamic properties. The calculated quantities include the 0 K static total energy curves and electronic band structures as well as density-of-states, the phonon density-of-states, together with the linear thermal expansion coefficients, the entropies, the enthalpies, the heat capacities, the bulk moduli, and the Debye temperature as functions of temperature up to 1200 K. Both the standard Perdew-Burke-Ernzerhof (PBE) and the Perdew-Burke-Ernzerhof revised for solids (PBEsol) exchange-correlational functionals were examined and it was found that the PBEsol functional was generally better than the PBE functional in describing both the crystal and electronic properties for the La3−xTe4.

Original languageEnglish (US)
Pages (from-to)417-426
Number of pages10
JournalComputational Materials Science
Volume142
DOIs
StatePublished - Feb 1 2018

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

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