  The estimation of (n-1)2 interdiffusion coefficients in an n component system
requires (n-1) diffusion paths to intersect or pass closely in the (n-1)
dimensional space according to the body diagonal diffusion couple method. These
interdiffusion coefficients are related to n(n-1) intrinsic (or n tracer
diffusion coefficients), which cannot be estimated easily following the
Kirkendall marker experiment in a multicomponent system despite their
importance for understanding the atomic mechanism of diffusion and the
physico-mechanical properties of materials. In this study, the estimation of
tracer diffusion coefficients from only two diffusion profiles following the
concept of the body diagonal diffusion couple method in a multicomponent system
is demonstrated. Subsequently, one can estimate the intrinsic and
interdiffusion coefficients. This reduces the overall effort up to a great
extent since it needs only two instead of (n-1) diffusion profiles irrespective
of the number of components, with an additional benefit of enabling the
estimation of all types of diffusion coefficients. The available tracer
diffusion coefficients estimated following the radiotracer method are compared
to the data estimated in this study following this method. This method can also
be extended to the systems in which the radiotracer method is not feasible.
