Isotope fractionation due to sedimentation of atoms in centrifuged indium-lead alloy

Masao Ono, Yusuke Iguchi, Satoru Okayasu, Fumitaka Esaka, Katsura Kobayashi, Ting Hao, Rabaya Bagum, Takahito Osawa, Kimio Fujii, Eizo Nakamura, Tsutomu Mashimo

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)


    The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge under a gravitational field of 0.81 × 106 g for 100 hours at 150 °C in solid state. The isotope ratio measurements were performed on the centrifuged sample with secondary ion mass spectrometer (SIMS, CAMECA IMS-6f). 206Pb/208Pb and 207Pb/ 208Pb isotope ratio changed with negative gradient in the direction of centrifugal force approximately 1.5% and 0.8%, respectively. There was a tendency that the heavy 208Pb isotope abundance increased and the light 206Pb isotope abundance decreased in the direction of centrifugal force. Three-isotope diagram of 206Pb/208Pb versus 207Pb/208Pb proved that the isotope fractionation depends on the isotopic mass difference. These results showed that a strong gravitational field not only affected the inter-diffusion but also the self-diffusion in this alloy by causing isotope fractionation effect, which was dependent on the mass-difference.

    Original languageEnglish
    Title of host publicationDiffusion in Materials - DIMAT2008
    PublisherTrans Tech Publications Ltd
    Number of pages6
    ISBN (Print)3908451728, 9783908451723
    Publication statusPublished - 2009
    Event7th International Conference on Diffusion in Materials - Lanzarote, Spain
    Duration: Oct 28 2008Oct 31 2008


    Other7th International Conference on Diffusion in Materials


    • Graded structure
    • Gravitational field
    • In isotope
    • In-Pb
    • Indium-lead
    • Isotope fluctuation
    • Isotope fractionation effect
    • Isotope separation
    • Pb isotope
    • Sedimentation
    • Ultracentrifuge

    ASJC Scopus subject areas

    • Radiation
    • Materials Science(all)
    • Condensed Matter Physics


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