Details
| Original language | English |
|---|---|
| Pages (from-to) | 482-487 |
| Number of pages | 6 |
| Journal | SOLID STATE IONICS |
| Volume | 70-71 |
| Issue number | PART 1 |
| Publication status | Published - 1994 |
Abstract
7Li-NMR measurements of the mixed ionic-electronic conductor β-LixAl1-x are presented for compositions covering the entire range of the β-phase. From NMR spectra the Knight shift K at room temperature was obtained as K<5 ppm in accordance with theoretical predictions. The measurements of the SLR rate T-11 revealed two regions of different dependences of the SLR rate on temperature T. Below 100 K a linear dependence T1T=const is observed which is assigned to coupling of conduction electrons. Above 100 K a sharp rise of the SLR rate and a maximum in T-11 (T) is found. The dependence of T-11 on the Larmor frequency is weaker than predicted by the standard theory for diffusion induced SLR. Here the SLR which is predominantly dipolar is described with spectral density functions typical for SLR in disordered ionic conductors. The deviation from the standard SLR behaviour is found to increase with the total concentration of defects.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: SOLID STATE IONICS, Vol. 70-71, No. PART 1, 1994, p. 482-487.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - 7Li-NMR on β-LiAl
T2 - Diffusion and electronic properties
AU - Clausen, D.
AU - Burmester, I.
AU - Heitjans, P.
AU - Schirmer, A.
PY - 1994
Y1 - 1994
N2 - 7Li-NMR measurements of the mixed ionic-electronic conductor β-LixAl1-x are presented for compositions covering the entire range of the β-phase. From NMR spectra the Knight shift K at room temperature was obtained as K<5 ppm in accordance with theoretical predictions. The measurements of the SLR rate T-11 revealed two regions of different dependences of the SLR rate on temperature T. Below 100 K a linear dependence T1T=const is observed which is assigned to coupling of conduction electrons. Above 100 K a sharp rise of the SLR rate and a maximum in T-11 (T) is found. The dependence of T-11 on the Larmor frequency is weaker than predicted by the standard theory for diffusion induced SLR. Here the SLR which is predominantly dipolar is described with spectral density functions typical for SLR in disordered ionic conductors. The deviation from the standard SLR behaviour is found to increase with the total concentration of defects.
AB - 7Li-NMR measurements of the mixed ionic-electronic conductor β-LixAl1-x are presented for compositions covering the entire range of the β-phase. From NMR spectra the Knight shift K at room temperature was obtained as K<5 ppm in accordance with theoretical predictions. The measurements of the SLR rate T-11 revealed two regions of different dependences of the SLR rate on temperature T. Below 100 K a linear dependence T1T=const is observed which is assigned to coupling of conduction electrons. Above 100 K a sharp rise of the SLR rate and a maximum in T-11 (T) is found. The dependence of T-11 on the Larmor frequency is weaker than predicted by the standard theory for diffusion induced SLR. Here the SLR which is predominantly dipolar is described with spectral density functions typical for SLR in disordered ionic conductors. The deviation from the standard SLR behaviour is found to increase with the total concentration of defects.
UR - http://www.scopus.com/inward/record.url?scp=17144436005&partnerID=8YFLogxK
U2 - 10.1016/0167-2738(94)90358-1
DO - 10.1016/0167-2738(94)90358-1
M3 - Article
AN - SCOPUS:17144436005
VL - 70-71
SP - 482
EP - 487
JO - SOLID STATE IONICS
JF - SOLID STATE IONICS
SN - 0167-2738
IS - PART 1
ER -