Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 8691-8694 |
| Seitenumfang | 4 |
| Fachzeitschrift | Journal of Physical Chemistry B |
| Jahrgang | 111 |
| Ausgabenummer | 30 |
| Publikationsstatus | Veröffentlicht - 2 Aug. 2007 |
Abstract
Li self-diffusion in rhombohedral Li7BiO6, being a promising basic material for cathodes of rechargeable ion batteries, is studied by means of 7Li stimulated echo NMR. Using the pulse sequence introduced by Jeener and Broekaert, a spin-alignment echo is created whose amplitude decay is recorded as a function of mixing time. The so-obtained two-time correlation functions follow stretched exponential behavior and lead to decay rates which can be identified directly with microscopic Li motional correlation rates (τ-1). Using a jump distance of about 0.2 nm, this results in a diffusion coefficient (D) of about 0.5 × 10 -16 m2 s-1 at 294 K. The activation energy turned out to be 0.53(3) eV which is in very good agreement with recently obtained results by means of dc-conductivity measurements probing long-range diffusion parameters. This shows that stimulated echo NMR, due to its inherent time scale, gives microscopic access to long-range transport. The prefactor τ0-1 of the corresponding Arrhenius law lies in the typical range of phonon frequencies, τ0-1 = 3 × 1012 s-1.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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in: Journal of Physical Chemistry B, Jahrgang 111, Nr. 30, 02.08.2007, S. 8691-8694.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Microscopic access to long-range diffusion parameters of the fast lithium ion conductor Li7BiO6 by solid state7Li stimulated echo NMR
AU - Wilkening, Martin
AU - Mühle, Claus
AU - Jansen, Martin
AU - Heitjans, Paul
PY - 2007/8/2
Y1 - 2007/8/2
N2 - Li self-diffusion in rhombohedral Li7BiO6, being a promising basic material for cathodes of rechargeable ion batteries, is studied by means of 7Li stimulated echo NMR. Using the pulse sequence introduced by Jeener and Broekaert, a spin-alignment echo is created whose amplitude decay is recorded as a function of mixing time. The so-obtained two-time correlation functions follow stretched exponential behavior and lead to decay rates which can be identified directly with microscopic Li motional correlation rates (τ-1). Using a jump distance of about 0.2 nm, this results in a diffusion coefficient (D) of about 0.5 × 10 -16 m2 s-1 at 294 K. The activation energy turned out to be 0.53(3) eV which is in very good agreement with recently obtained results by means of dc-conductivity measurements probing long-range diffusion parameters. This shows that stimulated echo NMR, due to its inherent time scale, gives microscopic access to long-range transport. The prefactor τ0-1 of the corresponding Arrhenius law lies in the typical range of phonon frequencies, τ0-1 = 3 × 1012 s-1.
AB - Li self-diffusion in rhombohedral Li7BiO6, being a promising basic material for cathodes of rechargeable ion batteries, is studied by means of 7Li stimulated echo NMR. Using the pulse sequence introduced by Jeener and Broekaert, a spin-alignment echo is created whose amplitude decay is recorded as a function of mixing time. The so-obtained two-time correlation functions follow stretched exponential behavior and lead to decay rates which can be identified directly with microscopic Li motional correlation rates (τ-1). Using a jump distance of about 0.2 nm, this results in a diffusion coefficient (D) of about 0.5 × 10 -16 m2 s-1 at 294 K. The activation energy turned out to be 0.53(3) eV which is in very good agreement with recently obtained results by means of dc-conductivity measurements probing long-range diffusion parameters. This shows that stimulated echo NMR, due to its inherent time scale, gives microscopic access to long-range transport. The prefactor τ0-1 of the corresponding Arrhenius law lies in the typical range of phonon frequencies, τ0-1 = 3 × 1012 s-1.
UR - http://www.scopus.com/inward/record.url?scp=34548258830&partnerID=8YFLogxK
U2 - 10.1021/jp0734979
DO - 10.1021/jp0734979
M3 - Article
AN - SCOPUS:34548258830
VL - 111
SP - 8691
EP - 8694
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 30
ER -