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in creator/contributor: "Rothman, S.J."  
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Self-Diffusion in Gamma Uranium

Description: The self-diffusion coefficient or uranium was measured at four temperatures in the gamma phase. The data are fitted by an Arrhenius-tyoe 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 codelations. (auth)
Date: July 1, 1959
Creator: Rothman, S. J.; Lloyd, L. T.; Weil, R. & Harkness, A. L.
Partner: UNT Libraries Government Documents Department
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Self-Diffusion in Beta Uranium. Partial Report--Metallurgy Division Program 4.1.2

Description: 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)
Date: July 1, 1960
Creator: Rothman, S. J.; Gray, J., Jr.; Hughes, J. P. & Harkness, A. L.
Partner: UNT Libraries Government Documents Department
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The Diffusion of Gold in Gamma Uranium

Description: The diffusion coefficient of tracer amounts of Au/sup 198/ in gamma U is described by an Arrhenius-type equation: D = 4.86 x 10 cm/sup -3/sec exp(-30,400 cal/mol/RT). The values of D/sub 0/ and the activation energy are close to those for self-diffusion in gamma U, indicating that the low activation energy for self- diffusion is due to a general weakness of the lattice rather than to easy compressibility of the U atom. (auth)
Date: May 1, 1960
Creator: Rothman, S. J.
Partner: UNT Libraries Government Documents Department
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Diffusion in Uranium, Its Alloys, and Compounds

Description: ABS>A review of laboratory diffusion studies on uranium and its compounds and alloys is presented. Included are results and analysis of studies on diffusion in single-phase and in multiphase U alloys, diffusion of gases in U, and diffusion in UO/sub 2/. (J.R.D.)
Date: May 1, 1961
Creator: Rothman, S. J.
Partner: UNT Libraries Government Documents Department
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The Diffusion of Chromium in Gamma Uranium. Partial Report-Metallurgy Program 4.1.27

Description: 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 … more
Date: June 1, 1961
Creator: Rothman, S. J.
Partner: UNT Libraries Government Documents Department
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Oxygen diffusion in cuprate superconductors

Description: Superconducting properties of the cuprate superconductors depend on the oxygen content of the material; the diffusion of oxygen is thus an important process in the fabrication and application of these materials. This article reviews studies of the diffusion of oxygen in La{sub 2}{sub {minus}}{sub {times}}Sr{sub {times}}CuO{sub 4}, YBa{sub 2}Cu{sub 3}O{sub 7}{sub {minus}}{delta}, YBa{sub 2}Cu{sub 4}O{sub 8}, and the Bi{sub 2}Sr{sub 2}Ca{sub n}{sub {minus}}{sub 1}Cu{sub n}O{sub 2}{sub +}{sub 4} (… more
Date: January 1, 1995
Creator: Routbort, J. L. & Rothman, S. J.
Partner: UNT Libraries Government Documents Department
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The Diffusion of Iron and Chromium in Beta Uranium

Description: This note presents the results of some measurements of the diffusion of iron and chromium in beta uranium carried out in connection with studies of the diffusion of these tracers in gamma uranium
Date: unknown
Creator: Rothman, S. J. (Steven J.); Peterson, N. L. & Moore, S. A.
Partner: UNT Libraries Government Documents Department
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