Core/shell ZrTiO4/LiAlSi2O6 nanocrystals: A synchrotron X-ray diffraction study of high-pressure compression

Kristina E. Lipinska-Kalita, Michael Pravica, Gino Mariotto, Patricia E. Kalita, Yoshimichi Ohki

    研究成果: Article

    3 引用 (Scopus)

    抄録

    In situ synchrotron X-ray diffraction studies have been performed on an optically transparent lithium-aluminosilicate glass-ceramic composite with nanometer-sized LiAlSi2O6 crystals embedded in a host matrix. The pressure-induced evolution of X-ray diffraction patterns was followed in compression up to 50 GPa and in subsequent decompression to ambient conditions. In the low-pressure range, the diffraction patterns illustrated a progressive shift and broadening of the diffraction lines consistent with a gradual densification of the LiAlSi2O6 phase. The unit cell volume of the LiAlSi2O6 nanocrystalline phase calculated for the compression sequence between ambient pressure and 12.5 GPa decreased by about 13.5%. At higher pressures, the diffraction patterns displayed considerable line broadenings indicating a partial amorphization of the nanocrystalline phase. Additionally, the patterns revealed the increasing presence of the ZrTiO4 phase which was nucleated in the host matrix prior to the crystallization of the LiAlSi2O6 main nanocrystalline phase. The diffraction pattern of the composite quenched from 50 GPa to ambient pressure conditions did not show full reversibility of pressure-induced changes. Despite the dominating presence of the broad diffraction bands, the diffraction pattern of the pressure-quenched material suggested that the decompressed structure carries at least a partial signature of the initial ambient LiAlSi2O6 phase.

    元の言語English
    ページ(範囲)2072-2076
    ページ数5
    ジャーナルJournal of Physics and Chemistry of Solids
    67
    発行部数9-10
    DOI
    出版物ステータスPublished - 2006 9

    Fingerprint

    Synchrotrons
    Nanocrystals
    nanocrystals
    synchrotrons
    diffraction patterns
    Diffraction patterns
    X ray diffraction
    diffraction
    x rays
    composite materials
    pressure reduction
    Diffraction
    densification
    matrices
    Amorphization
    Aluminosilicates
    Composite materials
    low pressure
    Glass ceramics
    lithium

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    これを引用

    Core/shell ZrTiO4/LiAlSi2O6 nanocrystals : A synchrotron X-ray diffraction study of high-pressure compression. / Lipinska-Kalita, Kristina E.; Pravica, Michael; Mariotto, Gino; Kalita, Patricia E.; Ohki, Yoshimichi.

    :: Journal of Physics and Chemistry of Solids, 巻 67, 番号 9-10, 09.2006, p. 2072-2076.

    研究成果: Article

    Lipinska-Kalita, Kristina E. ; Pravica, Michael ; Mariotto, Gino ; Kalita, Patricia E. ; Ohki, Yoshimichi. / Core/shell ZrTiO4/LiAlSi2O6 nanocrystals : A synchrotron X-ray diffraction study of high-pressure compression. :: Journal of Physics and Chemistry of Solids. 2006 ; 巻 67, 番号 9-10. pp. 2072-2076.
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    abstract = "In situ synchrotron X-ray diffraction studies have been performed on an optically transparent lithium-aluminosilicate glass-ceramic composite with nanometer-sized LiAlSi2O6 crystals embedded in a host matrix. The pressure-induced evolution of X-ray diffraction patterns was followed in compression up to 50 GPa and in subsequent decompression to ambient conditions. In the low-pressure range, the diffraction patterns illustrated a progressive shift and broadening of the diffraction lines consistent with a gradual densification of the LiAlSi2O6 phase. The unit cell volume of the LiAlSi2O6 nanocrystalline phase calculated for the compression sequence between ambient pressure and 12.5 GPa decreased by about 13.5{\%}. At higher pressures, the diffraction patterns displayed considerable line broadenings indicating a partial amorphization of the nanocrystalline phase. Additionally, the patterns revealed the increasing presence of the ZrTiO4 phase which was nucleated in the host matrix prior to the crystallization of the LiAlSi2O6 main nanocrystalline phase. The diffraction pattern of the composite quenched from 50 GPa to ambient pressure conditions did not show full reversibility of pressure-induced changes. Despite the dominating presence of the broad diffraction bands, the diffraction pattern of the pressure-quenched material suggested that the decompressed structure carries at least a partial signature of the initial ambient LiAlSi2O6 phase.",
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