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The fast impurity diffusion of 59 Fe in beta -Zr and beta -Zr-Fe alloys was investigated. Complementary information about the possible diffusion mechanism was achieved by examining the influence of Fe addition on the Zr self-diffusion (enhancement factor b). Further evidence on the diffusion process in detail was evaluated comparing the macroscopic tracer measurements with microscopic experiments where jump frequencies of the diffusing Fe atoms were studied by quasielastic Mossbauer spectroscopy. The overall mass transport of Fe in beta -Zr as observed by tracer measurements can be entirely explained by a dissociative diffusion mechanism. The diffusional line broadening observed by Mossbauer spectroscopy originates from diffusion via regular lattice sites (vacancy mechanism) where most of the Fe atoms are dissolved.
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Trampenau et al. (1990) studied this question.
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