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X-ray diffraction study of the icosahedral AlCuFe quasicrystal at megabar pressures

机译:二十面体AlCuFe准晶体在兆巴压力下的X射线衍射研究

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摘要

We report in-situ synchrotron X-ray diffraction study of icosahedral (i)-AlCuFe quasicrystal (QC) at high pressure up to 104 GPa under ambient temperature using the diamond anvil technique. With compression, there is no obvious change of the diffraction pattern within the measured pressure range. Five characteristic peaks from the i-AlCuFe QC maintain up to 104 GPa. The unit cell volume of the i-AlCuFe QC decreases monotonously until 72 GPa. The experimental P-V compression curve below 72 GPa was fitted to the Birch-Murnaghan equation of state with V-0=2023(19) angstrom(3), K-0=131(7) GPa, K'=4.0 (fixed). The resulting EoS parameters are approximately consistent with those observed in previous study. A discontinuous volume change is observed between 72 and 75 GPa. These observed results indicate a phase transition from i-AlCuFe QC to an approximant crystal (AC) which has a similar local atomic arrangement as the QC. This study suggests that i-AlCuFe QC maintains its structure at least up to 72 GPa and then transforms to AC with small displacement of atoms. (C) 2015 Elsevier B.V. All rights reserved.
机译:我们在室温下使用金刚石砧技术报告了二十面体(i)-AlCuFe准晶体(QC)在高达104 GPa的高压下的原位同步加速器X射线衍射研究。通过压缩,在测得的压力范围内,衍射图没有明显变化。 i-AlCuFe QC的五个特征峰保持高达104 GPa。 i-AlCuFe QC的晶胞体积单调减少直到72 GPa。低于72 GPa的实验P-V压缩曲线拟合到Birch-Murnaghan状态方程,其中V-0 = 2023(19)埃(3),K-0 = 131(7)GPa,K'= 4.0(固定)。最终的EoS参数与先前研究中观察到的参数基本一致。在72 GPa和75 GPa之间观察到不连续的体积变化。这些观察到的结果表明从i-AlCuFe QC到具有近似QC的局部原子排列的近似晶体(AC)的相变。这项研究表明,i-AlCuFe QC至少保持其结构高达72 GPa,然后以小的原子位移转变为AC。 (C)2015 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Materials Letters》 |2015年第15期|13-16|共4页
  • 作者单位

    Univ Tsukuba, Grad Sch Life & Environm Sci, Div Earth Evolut Sci, Tsukuba, Ibaraki 3058572, Japan;

    Univ Tsukuba, Grad Sch Life & Environm Sci, Div Earth Evolut Sci, Tsukuba, Ibaraki 3058572, Japan;

    Univ Tsukuba, Grad Sch Life & Environm Sci, Div Earth Evolut Sci, Tsukuba, Ibaraki 3058572, Japan;

    Univ Tsukuba, Grad Sch Life & Environm Sci, Div Earth Evolut Sci, Tsukuba, Ibaraki 3058572, Japan;

    Osaka Univ, Ctr Sci & Technol Extreme Condit, Toyonaka, Osaka 5608531, Japan;

    Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Icosahedral quasicrystal; High pressure; X-ray diffraction study; Diamond anvil cell;

    机译:二十面体准晶体;高压;X射线衍射研究;金刚石砧细胞;

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