Details
| Original language | English |
|---|---|
| Pages (from-to) | 555-564 |
| Number of pages | 10 |
| Journal | Journal of non-crystalline solids |
| Volume | 307-310 |
| Publication status | Published - Sept 2002 |
Abstract
Nanocrystalline materials can be regarded as heterogeneously structured materials with crystalline grains and disordered interfacial regions. This was verified unambiguously for nanocrystalline Li2O using NMR measurements. The heterogeneous structure shows up in the 7Li NMR line shapes and it results in a heterogeneous dynamic behavior of the Li ions with immobile ions in the grains and mobile ions in the interfacial regions leading to non-exponential recovery of the overall 7Li magnetization. The two different 7Li spin reservoirs can be discriminated via their different spin-spin relaxation rates T2-1 as well as their different spin-lattice relaxation rates T1-1. The biexponential relaxation behavior becomes more pronounced in the composite material Li2O:B2O3 where the volume fraction of interfacial regions and thus the number fraction of fast Li ions is enhanced.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Physics and Astronomy(all)
- Condensed Matter Physics
- Materials Science(all)
- Materials Chemistry
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In: Journal of non-crystalline solids, Vol. 307-310, 09.2002, p. 555-564.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Heterogeneous 7Li NMR relaxation in nanocrystalline Li2O:B2O3 composites
AU - Indris, Sylvio
AU - Heitjans, Paul
N1 - Funding Information: We are grateful to the Deutsche Forschungsgemeinschaft for financial support.
PY - 2002/9
Y1 - 2002/9
N2 - Nanocrystalline materials can be regarded as heterogeneously structured materials with crystalline grains and disordered interfacial regions. This was verified unambiguously for nanocrystalline Li2O using NMR measurements. The heterogeneous structure shows up in the 7Li NMR line shapes and it results in a heterogeneous dynamic behavior of the Li ions with immobile ions in the grains and mobile ions in the interfacial regions leading to non-exponential recovery of the overall 7Li magnetization. The two different 7Li spin reservoirs can be discriminated via their different spin-spin relaxation rates T2-1 as well as their different spin-lattice relaxation rates T1-1. The biexponential relaxation behavior becomes more pronounced in the composite material Li2O:B2O3 where the volume fraction of interfacial regions and thus the number fraction of fast Li ions is enhanced.
AB - Nanocrystalline materials can be regarded as heterogeneously structured materials with crystalline grains and disordered interfacial regions. This was verified unambiguously for nanocrystalline Li2O using NMR measurements. The heterogeneous structure shows up in the 7Li NMR line shapes and it results in a heterogeneous dynamic behavior of the Li ions with immobile ions in the grains and mobile ions in the interfacial regions leading to non-exponential recovery of the overall 7Li magnetization. The two different 7Li spin reservoirs can be discriminated via their different spin-spin relaxation rates T2-1 as well as their different spin-lattice relaxation rates T1-1. The biexponential relaxation behavior becomes more pronounced in the composite material Li2O:B2O3 where the volume fraction of interfacial regions and thus the number fraction of fast Li ions is enhanced.
UR - http://www.scopus.com/inward/record.url?scp=18744423395&partnerID=8YFLogxK
U2 - 10.1016/S0022-3093(02)01486-2
DO - 10.1016/S0022-3093(02)01486-2
M3 - Article
AN - SCOPUS:18744423395
VL - 307-310
SP - 555
EP - 564
JO - Journal of non-crystalline solids
JF - Journal of non-crystalline solids
SN - 0022-3093
ER -