Details
| Original language | English |
|---|---|
| Pages (from-to) | 2225-2231 |
| Number of pages | 7 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 5 |
| Issue number | 11 |
| Publication status | Published - 1 Jun 2003 |
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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Physical Chemistry Chemical Physics, Vol. 5, No. 11, 01.06.2003, p. 2225-2231.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Heterogeneous lithium diffusion in nanocrystalline Li2O:Al2O3 composites
AU - Wilkening, Martin
AU - Indris, Sylvio
AU - Heitjans, Paul
PY - 2003/6/1
Y1 - 2003/6/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0038519355&partnerID=8YFLogxK
U2 - 10.1039/b300908d
DO - 10.1039/b300908d
M3 - Article
AN - SCOPUS:0038519355
VL - 5
SP - 2225
EP - 2231
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 11
ER -