Heterogeneous lithium diffusion in nanocrystalline Li2O: Al2O3 composites

Martin Wilkening, Sylvio Indris, Paul Heitjans

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Li diffusion in the nanocrystalline composite system (1 - x)Li2O:xAl2O3 was studied by NMR measurements. Heterogeneous, biexponential 7Li NMR relaxation is found and two Li species with different dynamic behaviour can be discriminated via their individual spin-spin and spin-lattice relaxation times. The heterogeneous dynamics of the two Li species which also shows up in the 7Li NMR spectra reflects the heterogeneous structure of the nanocrystalline composites consisting of crystalline grains and a high volume fraction of interracial regions. The number fraction of fast Li ions located in the interfacial regions increases with temperature and insulator content x. Accordingly biexponential relaxation becomes more pronounced. From the temperature dependence of the two spin-lattice relaxation rates activation energies of about 0.3 eV for both the fast and the slow Li species are obtained, independent of the composition of the composites.

Original languageEnglish
Pages (from-to)2225-2231
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume5
Issue number11
DOIs
Publication statusPublished - 1 Jun 2003
Externally publishedYes

Fingerprint

Lithium
Spin-lattice relaxation
lithium
Nuclear magnetic resonance
spin-lattice relaxation
nuclear magnetic resonance
composite materials
Composite materials
Relaxation time
Large scale systems
Volume fraction
Activation energy
relaxation time
insulators
Ions
activation energy
Crystalline materials
Temperature
temperature dependence
Chemical analysis

ASJC Scopus subject areas

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

Cite this

Heterogeneous lithium diffusion in nanocrystalline Li2O : Al2O3 composites. / Wilkening, Martin; Indris, Sylvio; Heitjans, Paul.

In: Physical Chemistry Chemical Physics, Vol. 5, No. 11, 01.06.2003, p. 2225-2231.

Research output: Contribution to journalArticleResearchpeer-review

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