Details
| Original language | English |
|---|---|
| Pages (from-to) | 513-524 |
| Number of pages | 12 |
| Journal | Zeitschrift fur Physikalische Chemie |
| Volume | 226 |
| Issue number | 5-6 |
| Publication status | Published - Jun 2012 |
Abstract
Li diffusion parameters of a structurally disordered Li-Al-Si-oxide prepared by gas-phase synthesis were complementarily investigated by both time-domain NMR techniques and impedance spectroscopy. The first include 7Li NMR spin-lattice relaxation (SLR) measurements in the laboratory as well as in the rotating frame of reference. An analysis of variable-temperature NMR line widths point to an activation energy Ea of approximately 0.6 eV. The value is confirmed by rotating-frame SLR NMR data recorded at approximately 11 kHz. Above room temperature the low-temperature flank of a diffusion-induced rate peak shows up which can be approximated by an Arrhenius law yielding Ea = 0.56(1) eV. This is in very good agreement with the result obtained from 7Li spin-alignment echo (SAE) NMR being sensitive to even slower Li dynamics. For comparison, dc-conductivity measurements, probing long-range motions, yield Ea = 0.8 eV. Interestingly, lowtemperature SAE NMR decay rates point to localized Li motions being characterized with a very small activation energy of only 0.09 eV.
Keywords
- Impedance spectroscopy, Li diffusion, Non-stoichiometric compounds, Solid state NMR
ASJC Scopus subject areas
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Zeitschrift fur Physikalische Chemie, Vol. 226, No. 5-6, 06.2012, p. 513-524.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Studying Li dynamics in a gas-phase synthesized amorphous oxide by NMR and impedance spectroscopy
AU - Epp, Viktor
AU - Brünig, Christian
AU - Binnewies, Michael
AU - Heitjans, Paul
AU - Wilkening, Martin
N1 - Funding Information: We thank P. Bottke and A. Kuhn for valuable discussions. Financial support by the Deutsche Forschungsgemeinschaft (DFG) within the Research Unit 1277 “Mobilität von Li-Ionen in Festkörpern” (molife) is highly acknowledged.
PY - 2012/6
Y1 - 2012/6
N2 - Li diffusion parameters of a structurally disordered Li-Al-Si-oxide prepared by gas-phase synthesis were complementarily investigated by both time-domain NMR techniques and impedance spectroscopy. The first include 7Li NMR spin-lattice relaxation (SLR) measurements in the laboratory as well as in the rotating frame of reference. An analysis of variable-temperature NMR line widths point to an activation energy Ea of approximately 0.6 eV. The value is confirmed by rotating-frame SLR NMR data recorded at approximately 11 kHz. Above room temperature the low-temperature flank of a diffusion-induced rate peak shows up which can be approximated by an Arrhenius law yielding Ea = 0.56(1) eV. This is in very good agreement with the result obtained from 7Li spin-alignment echo (SAE) NMR being sensitive to even slower Li dynamics. For comparison, dc-conductivity measurements, probing long-range motions, yield Ea = 0.8 eV. Interestingly, lowtemperature SAE NMR decay rates point to localized Li motions being characterized with a very small activation energy of only 0.09 eV.
AB - Li diffusion parameters of a structurally disordered Li-Al-Si-oxide prepared by gas-phase synthesis were complementarily investigated by both time-domain NMR techniques and impedance spectroscopy. The first include 7Li NMR spin-lattice relaxation (SLR) measurements in the laboratory as well as in the rotating frame of reference. An analysis of variable-temperature NMR line widths point to an activation energy Ea of approximately 0.6 eV. The value is confirmed by rotating-frame SLR NMR data recorded at approximately 11 kHz. Above room temperature the low-temperature flank of a diffusion-induced rate peak shows up which can be approximated by an Arrhenius law yielding Ea = 0.56(1) eV. This is in very good agreement with the result obtained from 7Li spin-alignment echo (SAE) NMR being sensitive to even slower Li dynamics. For comparison, dc-conductivity measurements, probing long-range motions, yield Ea = 0.8 eV. Interestingly, lowtemperature SAE NMR decay rates point to localized Li motions being characterized with a very small activation energy of only 0.09 eV.
KW - Impedance spectroscopy
KW - Li diffusion
KW - Non-stoichiometric compounds
KW - Solid state NMR
UR - http://www.scopus.com/inward/record.url?scp=84862848107&partnerID=8YFLogxK
U2 - 10.1524/zpch.2012.0224
DO - 10.1524/zpch.2012.0224
M3 - Article
AN - SCOPUS:84862848107
VL - 226
SP - 513
EP - 524
JO - Zeitschrift fur Physikalische Chemie
JF - Zeitschrift fur Physikalische Chemie
SN - 0942-9352
IS - 5-6
ER -