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Report No.
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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, CAMECA IMS-6f). Both $$^{115}$$In/$$^{113}$$In and $$^{208}$$Pb/$$^{206}$$ isotope ratio changed with negative gradient in the direction of centrifugal force approximately 1.2% showing the tendency that the heavy $$^{115}$$In isotope ($$^{208}$$Pb isotope) abundance increased and light $$^{113}$$In isotope ($$^{206}$$Pb isotope) abundance decreased in the direction of centrifugal force. This showed that the isotope fractionation effect due to sedimentation of atoms occurred in this alloy by ultracentrifuge experiment.

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