Thermodynamic modeling of the sodium alanates and the Na-Al-H system

Caian Qiu, Susanne M. Opalka*, Gregory B. Olson, Donald L. Anton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The thermodynamic properties of the Al-Na and Na- Al-H systems have been assessed by combining the "calculation of phase diagram" approach with first-principles predictions. The Gibbs energies of the individual phases were thermodynamically modeled, where the model parameters were obtained from best fit optimizations to combined experimental and first-principles predicted finite temperature data. The first-principles thermodynamic predictions were based upon density functional theory ground state minimizations and direct method lattice dynamics. The predictions proved to be important adjuncts to the assessments whenever experimental measurements were lacking or not feasible. It was shown that the phase stability conditions of sodium alanates, NaAlH 4 and Na3AlH6, were well described with the present models.

Original languageEnglish (US)
Pages (from-to)1484-1494
Number of pages11
JournalInternational Journal of Materials Research
Volume97
Issue number11
DOIs
StatePublished - Nov 2006

Keywords

  • Density functional theory
  • Direct method lattice dynamics
  • First-principles
  • Sodium alanates
  • Thermodynamics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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