Abstract
The isotope effect for diffusion of 68Ge and 77Ge has been measured in pure copper and copper-germanium alloys employing their positron and electron emission. The high-energy particles chosen were separated in a magnetic spectrometer. The half-life of 77Ge could be determined as (672.6 ± 1.7) min, in excellent agreement with literature data. The most probable values for the correlation factor ƒ Ge are 0.52 ± 0.03 for infinite dilution, 0.55 ± 0.03 for 5.12 at. % Ge and 0.70 ± 0.02 at 9.52 at. % Ge. The data are discussed in the framework of the statistical alloy model of Manning, which is supposed to be less applicable due to the effective binding of Ge atoms to vacancies. Nevertheless, this model turns out to be not a bad approximation—apparently caused by complex formation of vacancies with more than one impurity atom enhanced by the binding and the associated decorrelation.
Published Version
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