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

Ono, Masao ; Iguchi, Yusuke*; Okayasu, Satoru ; Esaka, Fumitaka ; Kobayashi, Katsura*; Hao, T.; Bagum, R.*; Osawa, Takahito ; Fujii, Kimio; Nakamura, Eizo*; Mashimo, Tsutomu

The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge experiment under conditions that a gravitational field of 0.81$$times$$10$$^{6}$$ G for 100 hours at 150 $$^{circ}$$C in solid state in our previous study. The isotope ratio measurements were performed on the centrifuged sample with secondary ion mass spectrometer (SIMS). $$^{206}$$Pb/$$^{208}$$Pb and $$^{207}$$Pb/$$^{208}$$Pb isotope ratio changed with negative gradient in the direction of centrifugal force approximately 1.5% and 0.8%, respectively. And three-isotope diagram of $$^{206}$$Pb/$$^{208}$$Pb versus $$^{207}$$Pb/$$^{208}$$Pb proved that the isotope fluctuation depends on isotopic mass difference. These results showed that the strong gravitational field not only affected on the inter-diffusion but also on self-diffusion in this alloy as causing isotope fractionation effect, and the isotope fractionation was dependent on mass-difference.

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