Hydrogen absorption of nanocrystalline palladium

Toshiro Kuji, Yoshihito Matsumura, Hirohisa Uchida, Tatsuhiko Aizawa

研究成果: Conference article査読

104 被引用数 (Scopus)

抄録

Thermodynamic properties of hydrogen in nanocrystalline Pd (Pd-n) were determined by pressure-composition (P-C) isotherms. Pd-n was prepared by repeated compression-extrusion cycles in the die cavity of a high speed forging apparatus. It was found that Pd obtained was composed of nano-sized Pd grains, i.e. ∼10 nm, which were strained in 〈111〉 and 〈100〉 by 1.3 and 2.4%, respectively. From P-C isotherm measurements over the temperatures from 298 to 373 K, it was found that the hydrogen solubility in the α phase region for Pd-n was significantly larger than that for coarser grained Pd. On the other hand, Pd-n showed lower plateau pressures than coarser grained Pd. In addition to the above, the maximum hydrogen solubility of Pd-n was almost 50% lower than that for coarser grained Pd. The differences in the hydrogen solubility and plateau pressure between Pd-n and coarser grained Pd will be discussed under the consideration of the structure of nano-sized Pd grains. The drastic reduction in the maximum hydrogen solubility for Pd-n could be related to the viewpoint of strain of the octahedron in f.c.c. Pd.

本文言語English
ページ(範囲)718-722
ページ数5
ジャーナルJournal of Alloys and Compounds
330-332
DOI
出版ステータスPublished - 2002 1 17
イベントProceedings of the International Symposium on Metal-Hydrogen (MH 2000) - Noosa Heads, QLD, Australia
継続期間: 2000 10 12000 10 6

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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