分析電顕によるガーネット-ペロブスカイト相変態の研究 Analytical Electron Microscopy of Garnet-Perovskite Phase Transformation

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Natural pyrope garnets have been transformed at 35-60 GPa by a laser-heated diamond anvil cell (DAC), and the recovered samples were examined with an analytical electron microsoope (AEM). Orthorhombic perovskite was the dominant product phase after the transformation, and the Al content in perovskite increases with pressure and temperature. However, Al-rich perovskite was metastably inverted into the lithium niobate phase during the decompression. The mode of transition behavior of orthorhombic perovskite to the lithium niobate phase varies with the Al content in orthorhombic perovskite. Orthorhombic perovskite with less than 25 mol % Al<SUB>2</SUB>O<SUB>3</SUB> can be quenched as orthorhombic perovskite after the release of pressure. In contrast, perovskite with about 25-28 mol% Al<SUB>2</SUB>O<SUB>3</SUB> becomes the alternating lamellae of orthorhombic perovskite and the lithium niobate phases, having the topotactic relation with each other after the decompression. With further increasing the Al<SUB>2</SUB>O<SUB>3</SUB> content in perovskite, it is completely converted into the lithium niobate phase with polysynthetic twinning on {1012}<SUB>hex</SUB>. From this study, it was proved that, even for Al-rich garnets, the dominant post-garnet phase under the lower mantle condition is orthorhombic perovskite.

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 6(4), 230-235, 1997-11-01 

    The Japan Society of High Pressure Science and Technology

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各種コード

  • NII論文ID(NAID)
    10002848857
  • NII書誌ID(NCID)
    AN10452913
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0917639X
  • NDL 記事登録ID
    4367807
  • 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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