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, Eizou 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 publicationDefect and Diffusion Forum
Number of pages6
Publication statusPublished - 2009
Event7th International Conference on Diffusion in Materials - Lanzarote, Spain
Duration: Oct 28 2008Oct 31 2008

Publication series

NameDefect and Diffusion Forum
ISSN (Print)10120386


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

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

Cite this

Ono, M., Iguchi, Y., Okayasu, S., Esaka, F., Kobayashi, K., Hao, T., Bagum, R., Osawa, T., Fujii, K., Nakamura, E., & Mashimo, T. (2009). Isotope fractionation due to sedimentation of atoms in centrifuged indium-lead alloy. In Defect and Diffusion Forum (Vol. 289-292, pp. 63-68). (Defect and Diffusion Forum; Vol. 289-292).