Structural Phase Transition of Rutile-Type MgH_2 at High Pressures(Condensed matter: structure and mechanical and thermal properties)

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概要

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• The pressure-induced structural phase transition of MgH_2 was examined up to 57 GPa at room temperature. α-MgH_2 with the rutile-type structure at ambient conditions transformed to γ-MgH_2 with the α-PbO_2 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, MgH_2 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 Pbc2_1 and Pnma (cotunnite-type), respectively. Cotunnite-type MgH_2 was stable at pressures up to 57 GPa. Thus the proposed structural sequence of MgH_2 under pressure is rutile-type→αPbO_2→Pbc2_1→cotunnite-type, with an increase in the coordination number of magnesium ions from 6 to 9.

• 社団法人日本物理学会の論文
• 2006-07-15

著者

• NAKANO Satoshi

  National Institute for Material Science

• Kawamura Haruki

  Graduate School Of Material Science University Of Hyogo

• Akahama Yuichi

  Graduate School Of Material Science University Of Hyogo

• Takemura Kenichi

  National Institute For Materials Science

• MORIWAKI Toru

  Graduate School of Material Science, University of Hyogo

• Moriwaki Toru

  Graduate School Of Material Science University Of Hyogo

• NAKANO Satoshi

  National Institute for Materials Science

• AKAHAMA Yuichi

  Graduate School of Material Science, University of Hyogo

• KAWAMURA Haruki

  Graduate School of Material Science, University of Hyogo

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