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The problem of estimation of the tracer diffusion coefficients is solved byutilizing a novel tracer-interdiffusion couple technique even in the absencesuitable radioisotope of one of the components and absence of reliablethermodynamic parameters. This is demonstrated by generating reliable andreproducible mobility data in the alloys of the Fe-Ga system with a strongcomposition dependence of the diffusion coefficients. Tracer- (59Fe) andinter-diffusion are simultaneously measured in three couples Fe/Fe-16Ga,Fe/Fe-24Ga and Fe-16Ga/Fe-24Ga at 1143 K. The results obtained for the coupleswith different end-members are in an excellent agreement with each other forthe overlapping composition intervals. The influence of the molar volume on themeasured tracer- (59Fe) and inter-diffusion coefficients is evaluated. Usingthermodynamic calculations, the Ga tracer diffusion coefficient and the vacancywind factor are determined via the Darken-Manning relation for the compositionrange of 0-24 at.% Ga. The results confirm the reliability of thetracer-interdiffusion couple technique for producing highly accurate diffusiondata, in the present case for optimizing the mobility description of the bccphase of the Fe-Ga system. The Ga tracer diffusion coefficients are furtherestimated via experimental determination of the ratio of the Fe and Ga tracerdiffusivities at the Kirkendall marker planes and utilizing the Fe tracerdiffusion coefficients measured directly by the radiotracer method.

Composition dependence of tracer diffusion coefficients in Fe-Ga alloys: a case study by a tracer-interdiffusion couple method