Bulk nanocrystalline gamma magnesium hydride with low dehydrogenation temperature stabilized by plastic straining via high-pressure torsion

Kaveh Edalati, Kouki Kitabayashi, Yuji Ikeda, Junko Matsuda, Hai Wen Li, Isao Tanaka, Etsuo Akiba, Zenji Horita

研究成果: ジャーナルへの寄稿記事

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MgH2 with the α tetragonal structure was plastically strained using the high-pressure torsion (HPT) method and fully transformed to a nanonocrystalline γ orthorhombic phase with increasing the strain. The formation of nanocrystalline high-pressure γ phase resulted in decreasing the dehydrogenation temperature by 80 K. First-principles phonon calculations showed that both α and γ phases are dynamically stable, but the γ phase with the ionic binding has weaker hydrogen binding energy and accordingly lower dehydrogenation temperature. This study confirms the significance of crystal structure on thermal stability of hydrides for hydrogen storage applications.

元の言語英語
ページ(範囲)54-57
ページ数4
ジャーナルScripta Materialia
157
DOI
出版物ステータス出版済み - 12 2018

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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