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

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タイトル別名
  • Analytical Electron Microscopy of Garnet-Perovskite Phase Transformation.
  • ブンセキ デンケン ニヨル ガーネット ペロブスカイトソウ ヘンタイ ノ ケン

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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 % Al2O3 can be quenched as orthorhombic perovskite after the release of pressure. In contrast, perovskite with about 25-28 mol% Al2O3 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 Al2O3 content in perovskite, it is completely converted into the lithium niobate phase with polysynthetic twinning on {1012}hex. 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.

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