Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 011 |
| Seiten (von - bis) | 561-577 |
| Seitenumfang | 17 |
| Fachzeitschrift | Journal of Physics F: Metal Physics |
| Jahrgang | 15 |
| Ausgabenummer | 3 |
| Publikationsstatus | Veröffentlicht - 1985 |
| Extern publiziert | Ja |
Abstract
The spin-lattice relaxation (SLR) of polarised radioactive 8Li nuclei in solid Li-based alloys containing 2-11 at.% Mg and 1.6-10 at.% Ag was measured via their asymmetric beta -decay radiation. For temperatures T<200K SLR is due to conduction electrons only, and the Korringa relation is found to hold in the concentration range covered. For T=200-450K, SLR is additionally influenced by atomic diffusion. The diffusional contribution consists of a dipolar part as in pure Li and a quadrupolar part induced by the solute ions. The analysis is based on the concept of two-exponential SLR for spin I=2. In Li-Mg the self-diffusion of Li and the diffusion of the solute ions are found to be slowed down on alloying. The ratio of the jump rates of Li and Mg appears to be determined simply by their atomic masses. In the case of the dilute alloy Li-1.6 at.% Ag, which is amenable to theoretical diffusion models, comparison with tracer results favours an interstitial-vacancy pair mechanism. In the framework of this model Ag is found to diffuse faster than Li.
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in: Journal of Physics F: Metal Physics, Jahrgang 15, Nr. 3, 011, 1985, S. 561-577.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Diffusion processes in solid Li-Mg and Li-Ag alloys and the spin-lattice relaxation of 8Li
AU - Korblein, A.
AU - Heitjans, P.
AU - Stockmann, H.-J.
AU - Fujara, F.
AU - Ackermann, H.
AU - Buttler, W.
AU - Dorr, K.
AU - Grupp, H.
PY - 1985
Y1 - 1985
N2 - The spin-lattice relaxation (SLR) of polarised radioactive 8Li nuclei in solid Li-based alloys containing 2-11 at.% Mg and 1.6-10 at.% Ag was measured via their asymmetric beta -decay radiation. For temperatures T<200K SLR is due to conduction electrons only, and the Korringa relation is found to hold in the concentration range covered. For T=200-450K, SLR is additionally influenced by atomic diffusion. The diffusional contribution consists of a dipolar part as in pure Li and a quadrupolar part induced by the solute ions. The analysis is based on the concept of two-exponential SLR for spin I=2. In Li-Mg the self-diffusion of Li and the diffusion of the solute ions are found to be slowed down on alloying. The ratio of the jump rates of Li and Mg appears to be determined simply by their atomic masses. In the case of the dilute alloy Li-1.6 at.% Ag, which is amenable to theoretical diffusion models, comparison with tracer results favours an interstitial-vacancy pair mechanism. In the framework of this model Ag is found to diffuse faster than Li.
AB - The spin-lattice relaxation (SLR) of polarised radioactive 8Li nuclei in solid Li-based alloys containing 2-11 at.% Mg and 1.6-10 at.% Ag was measured via their asymmetric beta -decay radiation. For temperatures T<200K SLR is due to conduction electrons only, and the Korringa relation is found to hold in the concentration range covered. For T=200-450K, SLR is additionally influenced by atomic diffusion. The diffusional contribution consists of a dipolar part as in pure Li and a quadrupolar part induced by the solute ions. The analysis is based on the concept of two-exponential SLR for spin I=2. In Li-Mg the self-diffusion of Li and the diffusion of the solute ions are found to be slowed down on alloying. The ratio of the jump rates of Li and Mg appears to be determined simply by their atomic masses. In the case of the dilute alloy Li-1.6 at.% Ag, which is amenable to theoretical diffusion models, comparison with tracer results favours an interstitial-vacancy pair mechanism. In the framework of this model Ag is found to diffuse faster than Li.
UR - http://www.scopus.com/inward/record.url?scp=0001653280&partnerID=8YFLogxK
U2 - 10.1088/0305-4608/15/3/011
DO - 10.1088/0305-4608/15/3/011
M3 - Article
AN - SCOPUS:0001653280
VL - 15
SP - 561
EP - 577
JO - Journal of Physics F: Metal Physics
JF - Journal of Physics F: Metal Physics
SN - 0305-4608
IS - 3
M1 - 011
ER -