Defects formation in LaNi5 and its related alloys with hydrogenation and dehydrogenation

Etsuo Akiba, Kouji Sakaki, Yumiko Nakamura

研究成果: Chapter in Book/Report/Conference proceedingConference contribution


With hydrogenation and dehydrogenation, lattice of hydrogen absorbing alloys expands and contracts in 20 to 30 % in volume. Defects are expected to be introduced into the lattice to relax the strain energy that is generated by volume expansion and contraction. We have studied defect formation into the lattice of LaNi5 and related alloys using in-situ diffraction and positron lifetime measurements. In the lattice of LaNi52, a large amount of defects such as dislocations and vacancies was introduced at the first hydrogenation. Once defects were introduced, they were not relaxed at the working temperature of the alloys. Using diffraction method, we measured the size of crystallite before and after hydrogenation. The crystallite size did not changed with hydrogenation in all the alloy studied; LaNi5 and LaNi5-xMx (M=Al, Sn). Volume expansion and contraction can be accepted by introducing defects in the lattice without reducing the crystallite size.

ホスト出版物のタイトルAdvanced Materials for Energy Conversion III - A Symposium in Honor of Drs. Gary Sandrock, Louis Schlapbach and Seijirau Suda for Lifetime Achievements in Metal Hydride Research and Development
出版ステータス出版済み - 5 22 2006
イベント2006 TMS Annual Meeting - San Antonio, TX, 米国
継続期間: 3 12 20063 16 2006


名前TMS Annual Meeting


その他2006 TMS Annual Meeting
CitySan Antonio, TX

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 材料力学
  • 金属および合金


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