Structural Phase Transition of Rutile-Type MgH_2 at High Pressures

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Abstract

The pressure-induced structural phase transition of MgH<SUB>2</SUB> was examined up to 57 GPa at room temperature. α-MgH<SUB>2</SUB> with the rutile-type structure at ambient conditions transformed to γ-MgH<SUB>2</SUB> with the α-PbO<SUB>2</SUB> 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<SUB>2</SUB> 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 <I>Pbc</I>2<SUB>1</SUB> and <I>Pnma</I> (cotunnite-type), respectively. Cotunnite-type MgH<SUB>2</SUB> was stable at pressures up to 57 GPa. Thus the proposed structural sequence of MgH<SUB>2</SUB> under pressure is rutile-type → α-PbO<SUB>2</SUB> → <I>Pbc</I>2<SUB>1</SUB> → cotunnite-type, with an increase in the coordination number of magnesium ions from 6 to 9.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 75(7), "74603-1"-"74603-6", 2006-07-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110004777972
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00319015
  • NDL Article ID
    7973793
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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