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.

Self-Diffusion in Beta Uranium. Partial Report--Metallurgy Division Program 4.1.2
Self-Diffusion in Beta Uranium. Partial Report--Metallurgy Division Program 4.1.2

Author:

Publisher:

Published: 1960

Total Pages:

ISBN-13:

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The self-diffusion coefficient of U decreased from 3 x 10/sup -9/ cm/sup 2//sec at 785 deg C to 2.1 x 10/sup -11/ cm/sup 2//sec at 760 deg C. At temperatares high in the beta phase, the plots of log C vs. X/sup 2/ are curved, indicating that self-diffusion in beta U does not take place by isotropic volume diffusion alone. (auth).

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 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.