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Materials Science and Engineering
Missouri University of Science and Technology
Nickel<br />Radioactive tracers in metallurgy<br />Surface energy
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Surface Self-Diffusion On Nickel (111) By Radioactive Tracers, James Ronald Wolfe
Surface Self-Diffusion On Nickel (111) By Radioactive Tracers, James Ronald Wolfe
Doctoral Dissertations
"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 …