Self-diffusion in Gamma Uranium
Self-diffusion in Gamma Uranium

Author: S. J. Rothman

Publisher:

Published: 1959

Total Pages: 44

ISBN-13:

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The self-diffusion coefficient or uranium was measured at four temperatures in the gamma phase. The data are fitted by an Arrhenius-type equation D = 2.33 x well with previously reported results. The value of D/sub o/ is lower than that predicted by Zener's theory, and the activation energy is much less than the value expected from various empirical correlations.

The Diffusion of Chromium in Gamma Uranium
The Diffusion of Chromium in Gamma Uranium

Author: S. J. Rothman

Publisher:

Published: 1960

Total Pages: 38

ISBN-13:

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The diffusion of tracer amounts of chromium in gamma uranium was studied by the radioactive tracer-sectioning method. The temperature dependence of the diffusion coefficient D is given by D = 1.98 x 10−3 ( -2l,800/RT)cm sq./sec, in poor agreement with the data of Mosse, Levy, and Adda. Possible reasons for the discrepancy are discussed, and it is concluded that the present data are to be preferred as a basis for theoretical studies of the diffusion of tracers in gamma uranium. The difference between the activation energy and that for self-diffusion is also discussed; no conclusions are reached.

Self-diffusion in Beta Uranium
Self-diffusion in Beta Uranium

Author:

Publisher:

Published: 1960

Total Pages: 44

ISBN-13:

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The self-diffusion coefficient of uranium decreased from 3 x 10−9 cm sq./sec. at 785 deg C (gamma phase) to 2.1 x 10−11/ cm sq./sec. at 760 deg C (beta phase), dropping by a factor of one hundred and fifty on crossing from the gamma into the beta phase. Even at temperatures high in the beta phase, the plots of log C vs. X2 are curved, indicating that self-diffusion in beta U does not take place by isotropic volume diffusion alone.

The Diffusion of Chromium in Gamma Uranium. Partial Report-Metallurgy Program 4.1.27
The Diffusion of Chromium in Gamma Uranium. Partial Report-Metallurgy Program 4.1.27

Author:

Publisher:

Published: 1961

Total Pages:

ISBN-13:

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The diffusion of tracer amounts of chromium in gamma uranium was studied by the radioactive tracer-sectioning method. The temperature dependence of the diffusion coefficient D is given by D = 1.98 x 10/sup -3/ exp( --2l,800/RT)cm/sup 2// sec, in poor agreement with the data of Mosse, Levy, and Adda. Possible reasons for the discrepancy are discussed, and it is concluded that the present data are to be preferred as a basis for theoretical studies of the diffusion of tracers in gamma uranium. The difference between the activation energy and that for self-diffusion is also discussed; no conclusions are reached. (auth).