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

doi:10.4028/www.scientific.net/DDF.289-292.63

Paper Titles

Void Formation in the Growing Scale Induced by the Divergence of the Diffusive Ionic Flux in High Temperature Oxidation of Metals
p.1

Diffusion in Metallic Elements and Intermetallics
p.15

Selected Observations in Phase Constituents, Growth Kinetics and Microstructural Development of Aluminides in U-Mo vs. Al and 6061 Diffusion Couples Annealed at 600°C
p.41

Diffusion in Metal Dusting Processes
p.51

Isotope Fractionation due to Sedimentation of Atoms in Centrifuged Indium-Lead Alloy
p.63

Effect of a Low-Concentration H₃PO₄ Solution Application on High-Temperature Behaviour of Ti and Ti-Al Alloys
p.69

Structural Investigations of Solidification and Heat Treatments Influence on High Alloyed Cast Irons Grades with Nb-V-Ti Additions
p.77

Influence of Beta Stability on Hydrogen Diffusion in Various Beta Titanium Alloys
p.87

Grain Boundary Diffusion of Ni in Ultra-Fine Grain Copper-Lead Alloy Produced by Equal Channel Angular Pressing
p.95

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 289-292Isotope Fractionation due to Sedimentation of...

Isotope Fractionation due to Sedimentation of Atoms in Centrifuged Indium-Lead Alloy

Abstract:

The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge under a gravitational field of 0.81 x 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.