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Report No.

Positron lifetime measurement on centrifuged Bi$$_{3}$$Pb$$_{7}$$ intermetallic compound

Ono, Masao ; Huang, X. S.*; Shibata, Yasuhiro*; Iguchi, Yusuke*; Sakai, Seiji; Maekawa, Masaki; Chen, Z. Q.*; Osakabe, Toyotaka ; Kawasuso, Atsuo; Naramoto, Hiroshi*; Mashimo, Tsutomu

Recently, we formed atomic-scale graded structures in some miscible alloys and observed the decomposition in Bi$$_{3}$$Pb$$_{7}$$ intermetallic compound by sedimentation of atoms under strong gravitational field. In this study, we measured positron lifetime of centrifuged Bi$$_{3}$$Pb$$_{7}$$, to which the composition change was very small as it was treated at low temperature. It was found that the positron lifetime became longer than that of starting state. This indicated that the point defects (vacancy or divacancy) increased in the sample by centrifugal treatment. We are now investigating the relationship between increase in point defects and sedimentation of atoms.



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