Heterogeneous lithium diffusion in nanocrystalline Li2O: Al2O3 composites

Martin Wilkening; Sylvio Indris; Paul Heitjans

doi:10.1039/b300908d

Heterogeneous lithium diffusion in nanocrystalline Li₂O: Al₂O₃ composites

Martin Wilkening, Sylvio Indris, Paul Heitjans^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	2225-2231
Number of pages	7
Journal	Physical Chemistry, Chemical Physics
Volume	5
Issue number	11
DOIs	https://doi.org/10.1039/b300908d
Publication status	Published - 1 Jun 2003
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

Access to Document

10.1039/b300908d

Cite this

@article{f563f7e1a2bb4a738775b64c3a6359b6,

title = "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 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.",

author = "Martin Wilkening and Sylvio Indris and Paul Heitjans",

year = "2003",

month = jun,

day = "1",

doi = "10.1039/b300908d",

language = "English",

volume = "5",

pages = "2225--2231",

journal = "Physical Chemistry, Chemical Physics",

issn = "1463-9076",

publisher = "Royal Society of Chemistry",

number = "11",

}

TY - JOUR

T1 - Heterogeneous lithium diffusion in nanocrystalline Li2O

T2 - 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

SN - 1463-9076

VL - 5

SP - 2225

EP - 2231

JO - Physical Chemistry, Chemical Physics

JF - Physical Chemistry, Chemical Physics

IS - 11

ER -

Heterogeneous lithium diffusion in nanocrystalline Li₂O: Al₂O₃ composites

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this