Radiation-enhanced diffusion of Cu and Au tracer impurity atoms during Kr+ irradiation has been measured in amorphous Ni50Zr50 and Ni35Zr65 alloys in the range 80-573 K. At low temperatures, the spreading of the thin impurity layers was due to ion beam mixing and was independent of temperature. Above 400 K, the diffusion coefficient of Cu in Ni50Zr50 shows Arrhenius behavior with an apparent activation enthalpy of 0.55 eV, and it depends on the square root of dose rate. The radiation-enhanced diffusion coefficient is greater for Cu than Au and is also larger in the Zr-rich alloy.
ASJC Scopus subject areas
- Condensed Matter Physics