Seven-Fold Coordinated MgSe at 202 GPa

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Energy-dispersive x-ray diffraction studies at the Cornell High Energy Synchrotron Source were made to 202 GPa on MgSe which was found to undergo a phase transformation from the rocksalt to the seven-fold coordinated FeSi (or AuBe) structure with new peaks clearly evident at 99 GPa and internal position parameters continuing to change to the highest pressure. This is the first phase transition observed in the three magnesium chalcogenides which have the rocksalt structure at atmospheric pressure (MgSe, MgS and MgO) and may have important implications for transitions of MgO and MgS. The internal atomic positions u and w were accurately obtained as a function of pressure. This is the first accurate determination of internal atom positions above one megabar and above two megabars . The equation of state over the entire range obeyed a Birch equation with B<SUB>o</SUB> = 62. 8± 1. 6 GPa and B<SUB>o</SUB>' = 4. 1 ± 0. 1.

収録刊行物

  • 高圧力の科学と技術 = The Review of high pressure science and technology  

    高圧力の科学と技術 = The Review of high pressure science and technology 7, 260-262, 1998 

    The Japan Society of High Pressure Science and Technology

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各種コード

  • NII論文ID(NAID)
    10002689675
  • NII書誌ID(NCID)
    AN10452913
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0917639X
  • NDL 記事登録ID
    4493896
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z17-1589
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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