Local structure and dynamics of lithium garnet ionic conductors: tetragonal and cubic Li7La3Zr2O7

Matthew Klenk, Wei Lai

Research output: Contribution to journalArticle

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Abstract

To better understand the ionic conduction in lithium garnet oxides, we employed molecular dynamics simulation to investigate the local structure and dynamics of a model material Li7La3Zr2O12 and origin of its tetragonal to cubic phase transition. Our simulations were able to produce lattice parameter, neutron scattering, and conductivity data close to those gathered using experimental techniques, which allows us to study atomic-scale details of this complex material. First, it was found that lithium atoms primarily perform oscillation and "structured diffusion" dynamics in the tetragonal and cubic phase, respectively. Second, we believe that the tetragonal to cubic phase transition is an entropy-driven one that involves redistribution of lithium atoms among all tetrahedral sites. The transition is likely to initiate on the tetrahedral 8a site but needs the cooperation of neighboring octahedral 32g Li as relay atoms. Finally, it was found that a few types of lithium clusters dominate in both phases of Li7La3Zr2O12, which leads to highly correlated motion of lithium atoms. The local symmetry of these clusters dictates a "center-pass" mechanism as lithium goes through the bottleneck. This journal is

LanguageEnglish (US)
Pages8758-8768
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number14
DOIs
StatePublished - Apr 14 2015

Profile

Garnets
Lithium
garnets
conductors
lithium
Atoms
atoms
Phase transitions
Ionic conduction
relay
Neutron scattering
Oxides
Lattice constants
Molecular dynamics
lattice parameters
neutron scattering
Entropy
simulation
entropy
molecular dynamics

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Local structure and dynamics of lithium garnet ionic conductors : tetragonal and cubic Li7La3Zr2O7. / Klenk, Matthew; Lai, Wei.

In: Physical Chemistry Chemical Physics, Vol. 17, No. 14, 14.04.2015, p. 8758-8768.

Research output: Contribution to journalArticle

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