On the Determination of Interdiffusion Coefficients in Multi-Phase Diffusion
Shinji Tsuji, Kyuhiko Yamanaka · Journal of the Japan Institute of Metals and Materials · 1971
The general method for obtaining the interdiffusion coefficients \ ildeD in multi-phase diffusion is described for the case where the partial molal volum \barV of diffusing components shows a gap between the two phases which borders on the interface in the binary diffusion couple. When \ ildeD and \barV in each phase of the couple are considered to be constant, easily applicable relations for obtaining \ ildeD are deduced by employing a parameter which shows an apparent concentration of the substance moving in or out the interface. In case \ ildeD and \barV vary with composition, it is shown \ ildeD in each phase can be determined by using another parameter which expresses the relation between the moving rates of the interface and by modifying a part of Balluffi’s equation.