An efficient ab-initio quasiharmonic approach for the thermodynamics of solids

Liang Feng Huang, Xue Zeng Lu, Emrys Tennessen, James M. Rondinelli*

*Corresponding author for this work

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

A first-principles approach called the self-consistent quasiharmonic approximation (SC-QHA) method is formulated to calculate the thermal expansion, thermomechanics, and thermodynamic functions of solids at finite temperatures with both high efficiency and accuracy. The SC-QHA method requires fewer phonon calculations than the conventional QHA method, and also facilitates the convenient analysis of the microscopic origins of macroscopic thermal phenomena. The superior performance of the SC-QHA method is systematically examined by comparing it with the conventional QHA method and experimental measurements on silicon, diamond, and alumina. It is then used to study the effects of pressure on the anharmonic lattice properties of diamond and alumina. The thermal expansion and thermomechanics of Ca3Ti2O7, which is a recently discovered important ferroelectric ceramic with a complex crystal structure that is computationally challenging for the conventional QHA method, are also calculated using the formulated SC-QHA method. The SC-QHA method can significantly reduce the computational expense for various quasiharmonic thermal properties especially when there are a large number of structures to consider or when the solid is structurally complex. It is anticipated that the algorithm will be useful for a variety of fields, including oxidation, corrosion, high-pressure physics, ferroelectrics, and high-throughput structure screening when temperature effects are required to accurately describe realistic properties.

Original languageEnglish (US)
Pages (from-to)84-93
Number of pages10
JournalComputational Materials Science
Volume120
DOIs
StatePublished - Jul 1 2016

Keywords

  • Density functional theory
  • Quasiharmonic approximation
  • Thermal expansion
  • Thermomechanics

ASJC Scopus subject areas

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

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