Structural Phase Transition of Rutile-Type MgH₂ at High Pressures

• Moriwaki Toru

  Graduate School of Material Science, University of Hyogo

• Akahama Yuichi

  Graduate School of Material Science, University of Hyogo

• Kawamura Haruki

  Graduate School of Material Science, University of Hyogo

• Nakano Satoshi

  National Institute for Materials Science

• Takemura Kenichi

  National Institute for Materials Science

書誌事項

タイトル別名

• Structural Phase Transition of Rutile-Type MgH2 at High Pressures

抄録

The pressure-induced structural phase transition of MgH₂ was examined up to 57 GPa at room temperature. α-MgH₂ with the rutile-type structure at ambient conditions transformed to γ-MgH₂ with the α-PbO₂ structure. A complete conversion to the γ-phase, however, did not take place and these two phases coexisted up to 9 GPa. Above 9 GPa, MgH₂ transformed to the orthorhombic phase (HP1-phase), and further to another orthorhombic phase (HP2-phase) at around 17 GPa. Space groups of the HP1-phase and the HP2-phase were concluded to be Pbc2₁ and Pnma (cotunnite-type), respectively. Cotunnite-type MgH₂ was stable at pressures up to 57 GPa. Thus the proposed structural sequence of MgH₂ under pressure is rutile-type → α-PbO₂ → Pbc2₁ → cotunnite-type, with an increase in the coordination number of magnesium ions from 6 to 9.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 75 (7), 074603-, 2006

  一般社団法人 日本物理学会

キーワード

• MgH<SUB>2</SUB>
• high pressure
• structural phase transition
• X-ray diffraction
• diamond anvil cell

詳細情報

• CRID: 1390001204189543424
• NII論文ID: 110004777972
• NII論文ID: 210000106225
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.75.074603
• BIBCODE: 2006JPSJ...75g4603M
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7973793
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7973793
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.074603
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可