1968•Zeitschrift für Naturforschung AOpen access
Notizen: Heavy Isotopes of Protactinium
Ν. Trautmann, Richard Denig, N. Kaffrell, G. Herrmann
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Abstract
In Fig. 1 we have also plotted the equation for the diffusion coefficient of Au in lithium 2 and that for "self-diffusion" 3 (i.e. Li 6 -tracer in lithium).The striking feature of Fig. 1 is the small diffusivity observed in the present work, as compared with the very rapid diffusion rate for the univalent tracer.This is in qualitative contradiction to electrostatic theories 4 ' 5 according to which a polyvalent impurity should tend to diffuse faster than an univalent one.D0 (cm 2 sec -1 ) Q (kcal-mol -1 ) Ref. Li in Li 0.12 ±0.05 12.62 ±0.21 3 Au in Li 0.21 ±0.08 10.99 ±0.18 2 In in Li 0.39 ±0.25 15.87 ±0.36 Table 2. Impurity diffusion data in lithium.According to recent evidence 6 it is possible for certain impurities in polyvalent matrices to dissolve interstitially rather than substitutionally.The tendency for 1
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