Self-diffusion mechanisms in sodium

Feit, Michael D.

doi:10.1080/14786437208229302

Cited by 14 publications

(1 citation statement)

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“…Brown et al(1971a, b) reported that the simple vacancy mechanism must be ruled out and suggested that diffusion may take place via crowdions and split interstitials, one of these being metastable. Simultaneously Feit (1972) showed that the arguments of Brown et a1 are not very compelling, for both experimental and theoretical reasons. Feit finally claimed that a consistent explanation of Mundy's result can be made in terms of interstitials at low T, followed by vacancies.…”

Section: Letter To the Editormentioning

confidence: 98%

On the Growth of Entire Functions Represented by Regularly Convergent Function Series

Oskolkov¹

1976

Math. USSR Sb.

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The (tracer) diffusion coefficient D has been measured by Mundy in Na, for various pressures up to 9.46 kbar, at T = 288 K. The plot In D versus P showed a strong curvature, which has been previously attributed to the coexistence of various diffusion mechanisms. By following the theory described in the accompanying paper, we calculate the local com-pressibility~',of a single vacancy and we find that it exceeds the bulk one by a factor of 2-3.Therefore an important factor of the form exp Ji d d P has possibly been disregarded in the previous analysis of the curve In D versus P. Considering the correction introduced by such a factor, we confirm that the curvature in the isothermal plot In D versus P is exclusively due to the vacancy high local compressibility, over all the pressure range. Our mean x'-value, calculated only from bulk properties, is in striking agreement with a recent analysis made by Gilder and Lazarus.

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Section: Letter To the Editormentioning

confidence: 98%