Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 1359-1377 |
| Seitenumfang | 19 |
| Fachzeitschrift | Zeitschrift fur Physikalische Chemie |
| Jahrgang | 223 |
| Ausgabenummer | 10-11 |
| Publikationsstatus | Veröffentlicht - 2009 |
Abstract
In the present study the Li diffusivity in nanostructured samples of two glass forming model systems, spodumene (LiAlSi2O6) and lithium metaborate (LiBO2), was examined using 7Li nuclear magnetic resonance (NMR) spin-lattice relaxometry and dc conductivity measurements. The nanostructured samples were prepared by high-energy ball milling of the respective crystalline starting material on the one hand and the corresponding glass on the other hand. The diffusivity of the glass exceeds that of the crystalline sample for both systems. However, when the crystalline samples are mechanically treated by ball milling the diffusivity is enhanced. Nevertheless, the diffusivity of these nanocrystalline samples remains lower than that of the corresponding glass. Surprisingly, when the glassy samples are treated in the same way the diffusivity decreases. After sufficiently long milling times the diffusivity of these nanoglassy samples approaches that of the nanocrystalline samples. This convergence effect seems to be due to structural relaxation processes as is suggested by supplementary infrared spectroscopy and 27Al, 12B magic angle spinning NMR measurements.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Physikalische und Theoretische Chemie
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in: Zeitschrift fur Physikalische Chemie, Jahrgang 223, Nr. 10-11, 2009, S. 1359-1377.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Li Ion diffusion in nanocrystalline and nanoglassy LiAISi2O 6 and LiBO2 - Structuredynamics relations in two glass forming compounds
AU - Kuhn, Alexander
AU - Tobschall, Esther
AU - Heitjans, Paul
N1 - Funding Information: We are grateful to Martin Wilkening, Armin Feldhoff, Claus Rüscher, and Andre Düvel for help and fruitful discussions and thank the DFG for financial support.
PY - 2009
Y1 - 2009
N2 - In the present study the Li diffusivity in nanostructured samples of two glass forming model systems, spodumene (LiAlSi2O6) and lithium metaborate (LiBO2), was examined using 7Li nuclear magnetic resonance (NMR) spin-lattice relaxometry and dc conductivity measurements. The nanostructured samples were prepared by high-energy ball milling of the respective crystalline starting material on the one hand and the corresponding glass on the other hand. The diffusivity of the glass exceeds that of the crystalline sample for both systems. However, when the crystalline samples are mechanically treated by ball milling the diffusivity is enhanced. Nevertheless, the diffusivity of these nanocrystalline samples remains lower than that of the corresponding glass. Surprisingly, when the glassy samples are treated in the same way the diffusivity decreases. After sufficiently long milling times the diffusivity of these nanoglassy samples approaches that of the nanocrystalline samples. This convergence effect seems to be due to structural relaxation processes as is suggested by supplementary infrared spectroscopy and 27Al, 12B magic angle spinning NMR measurements.
AB - In the present study the Li diffusivity in nanostructured samples of two glass forming model systems, spodumene (LiAlSi2O6) and lithium metaborate (LiBO2), was examined using 7Li nuclear magnetic resonance (NMR) spin-lattice relaxometry and dc conductivity measurements. The nanostructured samples were prepared by high-energy ball milling of the respective crystalline starting material on the one hand and the corresponding glass on the other hand. The diffusivity of the glass exceeds that of the crystalline sample for both systems. However, when the crystalline samples are mechanically treated by ball milling the diffusivity is enhanced. Nevertheless, the diffusivity of these nanocrystalline samples remains lower than that of the corresponding glass. Surprisingly, when the glassy samples are treated in the same way the diffusivity decreases. After sufficiently long milling times the diffusivity of these nanoglassy samples approaches that of the nanocrystalline samples. This convergence effect seems to be due to structural relaxation processes as is suggested by supplementary infrared spectroscopy and 27Al, 12B magic angle spinning NMR measurements.
KW - Ion diffusion
KW - Lialsio
KW - Libo
KW - Nanocrystalline
KW - Nanoglassy
UR - http://www.scopus.com/inward/record.url?scp=75349096317&partnerID=8YFLogxK
U2 - 10.1524/zpch.2009.6084
DO - 10.1524/zpch.2009.6084
M3 - Article
AN - SCOPUS:75349096317
VL - 223
SP - 1359
EP - 1377
JO - Zeitschrift fur Physikalische Chemie
JF - Zeitschrift fur Physikalische Chemie
SN - 0942-9352
IS - 10-11
ER -