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Self-Diffusion Coefficient of Liquid Lithium
The coefficient of self-diffusion of 7Li in liquid lithium has been measured with nuclear magnetic resonance. The diffusion coefficient was determined from observations of the dependence of the spin-echo signal upon the amplitude of a pulsed magnetic field gradient. It is found that at the melting p...
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Published in: | The Journal of chemical physics 1968-06, Vol.48 (11), p.4938-4945 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The coefficient of self-diffusion of 7Li in liquid lithium has been measured with nuclear magnetic resonance. The diffusion coefficient was determined from observations of the dependence of the spin-echo signal upon the amplitude of a pulsed magnetic field gradient. It is found that at the melting point D = 6.8 ± 0.3 × 10−5cm2 / sec and (T / D) (dD / dT) = 2.8 ± 0.3. In terms of an activation model, D = 0.94 ± 0.4 × 10−3 exp [ − (2300 ± 300cal) / RT]cm2 / sec. Resultsare compared with the Cohen–Turnbull free-volume model and the Ascarelli–Paskin dense-gas model for liquid diffusion. From the free-volume model, the effective hardsphere diameter is determined for Li and, in addition, for Na and K as well. The results compare favorably with effective hard-sphere diameters determined from neutron-scattering data. |
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ISSN: | 0021-9606 1089-7690 |
DOI: | 10.1063/1.1668160 |