Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 009 |
| Seiten (von - bis) | 41-54 |
| Seitenumfang | 14 |
| Fachzeitschrift | Journal of Physics F: Metal Physics |
| Jahrgang | 15 |
| Ausgabenummer | 1 |
| Publikationsstatus | Veröffentlicht - 1985 |
| Extern publiziert | Ja |
Abstract
Self-diffusion in solid Li was studied via the spin-lattice relaxation of polarised radioactive 8Li nuclei using their asymmetric beta -decay radiation. The diffusion-induced spin-lattice relaxation rate 1/T 1diff was measured as a function of temperature from the melting point Tm=454K down to about 1/2Tm and as a function of the magnetic field from 8 to 700 mT. 1/T1diff can be explained assuming the nuclear dipole-dipole interaction alone. The data are analysed in the frame of the encounter model of correlated self-diffusion. The macroscopic self-diffusion coefficient DSD is determined over almost seven decades. A deviation from Arrhenius behaviour at elevated temperatures is interpreted in terms of a combined monovacancy/divacancy (1V/2V) mechanism. The correlation factor obtained from DSD and tracer self-diffusion coefficients DT, measured by mass spectroscopy, has a temperature dependence which is consistent with the 1V/2V model. The question of the possible existence of a non-classical isotope effect cannot be settled by a comparison of the present DSD values with those known from conventional nuclear magnetic resonance on 7Li.
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in: Journal of Physics F: Metal Physics, Jahrgang 15, Nr. 1, 009, 1985, S. 41-54.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Self-diffusion in solid lithium probed by spin-lattice relaxation of 8Li nuclei
AU - Heitjans, P.
AU - Korblein, A.
AU - Ackermann, H.
AU - Dubbers, D.
AU - Fujara, F.
AU - Stockmann, H.-J.
PY - 1985
Y1 - 1985
N2 - Self-diffusion in solid Li was studied via the spin-lattice relaxation of polarised radioactive 8Li nuclei using their asymmetric beta -decay radiation. The diffusion-induced spin-lattice relaxation rate 1/T 1diff was measured as a function of temperature from the melting point Tm=454K down to about 1/2Tm and as a function of the magnetic field from 8 to 700 mT. 1/T1diff can be explained assuming the nuclear dipole-dipole interaction alone. The data are analysed in the frame of the encounter model of correlated self-diffusion. The macroscopic self-diffusion coefficient DSD is determined over almost seven decades. A deviation from Arrhenius behaviour at elevated temperatures is interpreted in terms of a combined monovacancy/divacancy (1V/2V) mechanism. The correlation factor obtained from DSD and tracer self-diffusion coefficients DT, measured by mass spectroscopy, has a temperature dependence which is consistent with the 1V/2V model. The question of the possible existence of a non-classical isotope effect cannot be settled by a comparison of the present DSD values with those known from conventional nuclear magnetic resonance on 7Li.
AB - Self-diffusion in solid Li was studied via the spin-lattice relaxation of polarised radioactive 8Li nuclei using their asymmetric beta -decay radiation. The diffusion-induced spin-lattice relaxation rate 1/T 1diff was measured as a function of temperature from the melting point Tm=454K down to about 1/2Tm and as a function of the magnetic field from 8 to 700 mT. 1/T1diff can be explained assuming the nuclear dipole-dipole interaction alone. The data are analysed in the frame of the encounter model of correlated self-diffusion. The macroscopic self-diffusion coefficient DSD is determined over almost seven decades. A deviation from Arrhenius behaviour at elevated temperatures is interpreted in terms of a combined monovacancy/divacancy (1V/2V) mechanism. The correlation factor obtained from DSD and tracer self-diffusion coefficients DT, measured by mass spectroscopy, has a temperature dependence which is consistent with the 1V/2V model. The question of the possible existence of a non-classical isotope effect cannot be settled by a comparison of the present DSD values with those known from conventional nuclear magnetic resonance on 7Li.
UR - http://www.scopus.com/inward/record.url?scp=30244573623&partnerID=8YFLogxK
U2 - 10.1088/0305-4608/15/1/009
DO - 10.1088/0305-4608/15/1/009
M3 - Article
AN - SCOPUS:30244573623
VL - 15
SP - 41
EP - 54
JO - Journal of Physics F: Metal Physics
JF - Journal of Physics F: Metal Physics
SN - 0305-4608
IS - 1
M1 - 009
ER -