Issue 11, 2003

Heterogeneous lithium diffusion in nanocrystalline Li2O:Al2O3 composites

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 interfacial 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.

Article information

Article type
Paper
Submitted
23 Jan 2003
Accepted
17 Apr 2003
First published
06 May 2003

Phys. Chem. Chem. Phys., 2003,5, 2225-2231

Heterogeneous lithium diffusion in nanocrystalline Li2O:Al2O3 composites

M. Wilkening, S. Indris and P. Heitjans, Phys. Chem. Chem. Phys., 2003, 5, 2225 DOI: 10.1039/B300908D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements