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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