Structural Phase Transition of Rutile-Type MgH2 at High Pressures
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- Moriwaki Toru
- Graduate School of Material Science, University of Hyogo
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- Akahama Yuichi
- Graduate School of Material Science, University of Hyogo
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- Kawamura Haruki
- Graduate School of Material Science, University of Hyogo
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- Nakano Satoshi
- National Institute for Materials Science
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- Takemura Kenichi
- National Institute for Materials Science
Bibliographic Information
- Other Title
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- Structural Phase Transition of Rutile-Type MgH<sub>2</sub> at High Pressures
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Abstract
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.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 75 (7), 074603-, 2006
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001204189543424
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- NII Article ID
- 110004777972
- 210000106225
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- NII Book ID
- AA00704814
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- BIBCODE
- 2006JPSJ...75g4603M
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 7973793
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed