Molecular dynamics investigations of grain boundary phenomena in cubic zirconia

Craig A.J. Fisher, Hideaki Matsubara

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Yttria stabilized zirconia (YSZ) is a fast oxide ion conducting ceramic with the cubic fluorite structure that is used in a number of applications, including solid oxide fuel cells (SOFCs). A molecular dynamics (MD) study has been performed on symmetrical tilt grain boundaries with the Σ5 (3 1 0)/[0 0 1] 0 = 36.9° misorientation to investigate the structure and dynamics of interfaces in this technologically important material. Simulations were performed on systems of 1920 atoms at constant temperatures up to 2673 K. Atomic interactions were described by a simple pair potential model of the Buckingham form. Structural relaxation produced an open structure corresponding to the introduction of a row of Schottky defects adjacent and parallel to the interface. Oxygen diffusion along the boundary was observed at high temperature, even without vacancies in the bulk being introduced explicitly by aliovalent doping. However, the diffusion rate was lower than that in single crystals of 8 mol% Y2O3 stabilized zirconia. Further simulations demonstrated that interfaces between perfect zirconia crystals are sources of resistance in these ionically conducting systems.

Original languageEnglish
Pages (from-to)177-184
Number of pages8
JournalComputational Materials Science
Volume14
Issue number1-4
Publication statusPublished - 1999 Feb 1

Keywords

  • Atomistic simulation
  • Diffusion
  • Grain boundary
  • Molecular dynamics
  • Oxide ion
  • YSZ
  • Zirconia

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Molecular dynamics investigations of grain boundary phenomena in cubic zirconia'. Together they form a unique fingerprint.

Cite this