Hydrogen concentration dependence of tritium tracer diffusion coefficient in alpha phase of niobium

Kan Sakamoto, Kenichi Hashizume, Masayasu Sugisaki

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    In order to examine influences of coexistent hydrogen isotopes on diffusion behavior of tritium in niobium, tracer diffusion coefficients Dtof tritium in alpha phase of hydrogenated and deuterized niobium (α-NbHxTyand α-NbDxTy(x<0,8, y<<x)) have been measured at 473 K, 493 K and 553 K. The data on Dtshow typical hydrogen concentration dependence: Dtof tritium for both α-NbHxTy, and α-NbDxTy, decreases with hydrogen concentration under all experimental conditions. The obtained concentration dependence of Dtof tritium differs from that of Dtof protium in α-NbHxor of deuterium in α-NbHxTy. On the other hand, no appreciable differences in the concentration dependence of Dtof tritium between α-NbHxTy, and α-NbDxTy, are observed: there are no definite isotope effects due to the coexisting hydrogen isotopes. This result suggests that Dtof tritium for a tritiated niobium (α-NbTx) is not very different from that for α-NbHxTyand α-NbDxTy. The chemical diffusion coefficient D* of tritium is also evaluated on the basis of the obtained Dtof tritium and of a literature value of a thermodynamic factor F for Nb-H and Nb-D systems.

    Original languageEnglish
    Pages (from-to)811-815
    Number of pages5
    Journaljournal of nuclear science and technology
    Volume43
    Issue number7
    DOIs
    Publication statusPublished - Jan 1 2006

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Nuclear Energy and Engineering

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