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Author Mackliet, C. A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ COBALT ♦ COPPER ♦ DIFFUSION ♦ ELEMENTARY PARTICLES ♦ ENERGY RANGE ♦ HIGH TEMPERATURE ♦ IRON ♦ LOW TEMPERATURE ♦ MANGANESE ♦ MEASURED VALUES ♦ MONOCRYSTALS ♦ NICKEL ♦ TEMPERATURE ♦ TRACER TECHNIQUES
Abstract The rates of diffusion of radioactive tracers of Fe, Co, and Ni in single crystals of pure copper have been measured as a function of temperature from about 700 to 1075 deg C. The results, obtained by the tracer-sectioning technique, are as follows: D/sub Fe yields Cu/ = 1.4 exp(-51,800/RT); D/sub Co yields Cu/ = 193 exp(--54,100/RT); D/sub Ni yields Cu/ = 2.7 exp(--56,500/RT); all in units of cm/sup 2/sec. An exploratory measurement for a Mn tracer in copper was made at 1069 deg C with the result D = 1.49 x 10/sup -8/ cm/sup 2/sec. The results of several current theoretical calculations are compared with the present data: Wert and Zener's correlation of D/sub O/ and Q is supported by the present work; the basic qualitative prediction of Lazarus' screening theory is borne out by the present results, although the extent of the detailed agreement is not clear at this time. The experimental data yielded unexpectedly large diffusion coefficients at low temperatures in some cases and several possible causes are considered. Finally, a new experimentel method is described for determining diffusion coefficients with tracers emitting only very low--energy particles. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1958-03-15
Publisher Department Univ. of Ill., Urbana
Journal Physical Review
Volume Number 109
Organization Univ. of Ill., Urbana


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