1985 Volume 26 Issue 6 Pages 385-389
Ratios of the intrinsic diffusion coefficients relative to the number of mole fixed frame of reference in the α phase of Ag–Cd alloys at 1073 K and Ag–Zn alloys at 1023 K have been determined by vapor-thin plate method. Although the method is only applicable to a system in which one of the components has high vapor pressure in contrast with negligible vapor pressure of the other component, the ratios of the intrinsic diffusivities can be determined easily and precisely at desired compositions without requirement of concentration-penetration profiles and laborious examinations of the marker shifts. The ratio of the intrinsic diffusivities, DZnN⁄DAgN, in the concentration range between 2.2 and 13.7 at%Zn increases from 1.3 to 2.5 with increasing Zn concentration. The ratio, DCdN⁄DAgN, in the range between 2.5 and 13 at%Cd is almost constant to be 1.3.
