"Surface self-diffusion coefficients have been measured by a radioactive tracer method over the temperature range 614⁰ to 840⁰C on nickel (111) surfaces characterized by LEED. Previously unrecognized tracer evaporation during surface diffusion resulted in restricted spreading of the tracer at higher temperatures. A theoretical treatment of the tracer evaporation phenomenon is presented and subsequently used in the analysis of the data. The temperature dependence of the surface self-diffusion coefficient (Ds) for nickel (111) can be represented, over the experimental temperature range, by a single Arrhenius type relationship...Arguments are presented to justify an adatom surface diffusion mechanism which is characterized by trapping of the diffusing tracer atoms at ledge sites on a Terrace-Ledge-Kink (TLK) surface. The major portion of the 7.7 kcal/mol activation energy for surface self-diffusion is attributed to freeing the diffusing atom from the ledge"--Abstract, page ii.
Weart, Harry W.
Frad, William A., 1909-1974
Leighly, Hollis, P.
Moore, Robert E., 1930-2003
Materials Science and Engineering
Ph. D. in Metallurgical Engineering
University of Missouri--Rolla
x, 105 pages
© 1968 James Ronald Wolfe, All rights reserved.
Dissertation - Open Access
Radioactive tracers in metallurgy
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Electronic OCLC #
Link to Catalog Record
Wolfe, James Ronald, "Surface self-diffusion on nickel (111) by radioactive tracers" (1968). Doctoral Dissertations. 2283.