Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 9291-9300 |
| Seitenumfang | 10 |
| Fachzeitschrift | Journal of Physical Chemistry C |
| Jahrgang | 112 |
| Ausgabenummer | 25 |
| Frühes Online-Datum | 30 Mai 2008 |
| Publikationsstatus | Veröffentlicht - 1 Juni 2008 |
Abstract
Lithium tantalum oxide, LiTaO3, with an average particle size in the μm range is known as a very poor Li ion conductor. It is shown here that its Li conductivity can be drastically increased by ball milling. The so-obtained nanostructured powder with an average particle size of about 20 nm shows a dc conductivity, σdc, of about 3 × 10 -6 S cm-1 at T = 450 K (σdcT = 1.4 × 10-3 S cm-1 K) which is about 5 orders of magnitude larger than that of the corresponding microcrystalline powder at the same temperature. The activation energy EA is reduced by about one-third, i.e., it decreased from EA = 0.90(1) eV to about E A = 0.63(1) eV. The effect of different milling times on the ionic conductivity is studied. Furthermore, the thermal stability of the nanocrystalline materials against grain growth has been examined by in situ impedance spectroscopy. Interestingly, the Li conductivity of a sample milled for 16 h does not change much even when the material is exposed to about 700 K for several hours. Moreover, the Li self-diffusion in the nanostructured as well as the coarse grained materials has been investigated by various solid-state 7Li NMR techniques.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Energie (insg.)
- Allgemeine Energie
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
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in: Journal of Physical Chemistry C, Jahrgang 112, Nr. 25, 01.06.2008, S. 9291-9300.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Tuning the Li diffusivity of poor ionic conductors by mechanical treatment
T2 - High Li conductivity of strongly defective LiTaO3 nanoparticles
AU - Wilkening, M.
AU - Epp, Viktor
AU - Feldhoff, Armin
AU - Heitjans, Paul
PY - 2008/6/1
Y1 - 2008/6/1
N2 - Lithium tantalum oxide, LiTaO3, with an average particle size in the μm range is known as a very poor Li ion conductor. It is shown here that its Li conductivity can be drastically increased by ball milling. The so-obtained nanostructured powder with an average particle size of about 20 nm shows a dc conductivity, σdc, of about 3 × 10 -6 S cm-1 at T = 450 K (σdcT = 1.4 × 10-3 S cm-1 K) which is about 5 orders of magnitude larger than that of the corresponding microcrystalline powder at the same temperature. The activation energy EA is reduced by about one-third, i.e., it decreased from EA = 0.90(1) eV to about E A = 0.63(1) eV. The effect of different milling times on the ionic conductivity is studied. Furthermore, the thermal stability of the nanocrystalline materials against grain growth has been examined by in situ impedance spectroscopy. Interestingly, the Li conductivity of a sample milled for 16 h does not change much even when the material is exposed to about 700 K for several hours. Moreover, the Li self-diffusion in the nanostructured as well as the coarse grained materials has been investigated by various solid-state 7Li NMR techniques.
AB - Lithium tantalum oxide, LiTaO3, with an average particle size in the μm range is known as a very poor Li ion conductor. It is shown here that its Li conductivity can be drastically increased by ball milling. The so-obtained nanostructured powder with an average particle size of about 20 nm shows a dc conductivity, σdc, of about 3 × 10 -6 S cm-1 at T = 450 K (σdcT = 1.4 × 10-3 S cm-1 K) which is about 5 orders of magnitude larger than that of the corresponding microcrystalline powder at the same temperature. The activation energy EA is reduced by about one-third, i.e., it decreased from EA = 0.90(1) eV to about E A = 0.63(1) eV. The effect of different milling times on the ionic conductivity is studied. Furthermore, the thermal stability of the nanocrystalline materials against grain growth has been examined by in situ impedance spectroscopy. Interestingly, the Li conductivity of a sample milled for 16 h does not change much even when the material is exposed to about 700 K for several hours. Moreover, the Li self-diffusion in the nanostructured as well as the coarse grained materials has been investigated by various solid-state 7Li NMR techniques.
UR - http://www.scopus.com/inward/record.url?scp=49649115782&partnerID=8YFLogxK
U2 - 10.1021/jp801537s
DO - 10.1021/jp801537s
M3 - Article
AN - SCOPUS:49649115782
VL - 112
SP - 9291
EP - 9300
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 25
ER -