MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Lattice Defect Behavior of LaNi4.97Sn0.27 during Hydrogenation Cycles
Kouji SakakiYumiko NakamuraYasuharu ShiraiRobert C. , Jr. BowmanEtsuo Akiba
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2006 Volume 47 Issue 8 Pages 1875-1877

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Abstract

Lattice defect behavior of LaNi4.97Sn0.27 during the hydrogenation cycles has been investigated by in-situ positron lifetime measurement. Mean positron lifetime increased and decreased by each hydrogenation and dehydrogenation, respectively, independently of the hydrogenation cycles. It suggests that lattice defects are introduced by the hydrogenation and removed from the lattice by the dehydrogenation even at below the migration temperature of vacancy in LaNi5. Furthermore, dislocation density and vacancy concentration kept almost constant at the value of around 6×109 cm−2 and 10 ppm through at least eight hydrogenation/dehydrogenation cycles.

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© 2006 The Japan Institute of Metals and Materials
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