An experimental procedure was described for the carrying out of high-temperature diffusion studies which involved a liquid phase. The method was successfully demonstrated for diffusion in binary refractory alloy systems at 1930 to 2360K. The present method yielded diffusion data for the solid solutions and intermediate phases in each of the systems. Tracer diffusion coefficients were determined for infinite dilution, without using radio tracers. Values of the interdiffusion coefficients were determined by using both the concentration gradient and the chemical potential gradient as the driving force.

Diffusion Studies in Hf-Nb, Zr-Mo, Cr-Nb, Cr-Ta and Th-Re Systems above 1900K. Y.J.Bhatt, L.Kumar, R.V.Patil, G.B.Kale, S.P.Garg: Journal of Alloys and Compounds, 2000, 302[1-2], 177-86