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首页> 外文期刊>Crystal growth & design >Real-Time Atomic Scale Observation of Surface-Induced Crystallization of a Bismuth Nanodroplet by Stepwise Ordering Mechanism
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Real-Time Atomic Scale Observation of Surface-Induced Crystallization of a Bismuth Nanodroplet by Stepwise Ordering Mechanism

机译：通过逐步排序机构对铋纳米杆状物的表面诱导结晶的实时原子规模观察

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摘要

Surface-induced crystallization of an isotropic Bi nano droplet in three distinct steps was recorded at atomic resolution by in situ high resolution transmission electron microscopy. First, formation of a crystalline nucleus at the edge of the nanodroplet is induced by the liquid state surface faceting, which initiates the formation of a prefreezing state with a distorted structure. Then, a periodic line pattern of the atomic columns with a periodicity of 0.49 nm that is relative to the interlayer spacing of the Bi crystal along the (112)* direction (one-dimensional ordered structure) was formed by structure relaxation of the prefreezing nanoparticle, followed by a concerted growth and ordering process. Finally, the crystallization from the periodic structure was carried out by atom/atom interactions within and between the atomic layers to form the covalent Bi Bi bonds that have the same arrangement as in the Bi crystal (crystallization along the (110) direction). Motivated by the experimental observations, a stepwise ordering mechanism on the crystallization of a nanodroplet is revealed, which would provide new insight into the dynamics of phase transitions, crystal growth, and three-dimensional crystallization of supercrystals.
机译：通过原位高分辨率透射电子显微镜以原子分辨率记录三个不同步骤中各向同性Bi纳米液滴的表面诱导的结晶。首先，通过液体状态刻面诱导纳米射线边缘处的结晶核的形成，该液态表面刻面引发了具有扭曲结构的预折叠状态的形成。然后，通过沿预处理纳米颗粒的结构松弛形成具有0.49nm的周期性的原子柱的周期性柱的周期性柱，其相对于（112）*方向（一维有序结构）形成，其次是一项协调一致的增长和订购过程。最后，通过原子层内部和原子层内的原子/原子相互作用来进行周期性结构的结晶，以形成具有与BI晶体中相同的布置的共价BI BI键（沿（110）方向结晶）。通过实验观察，揭示了纳米射波的结晶上的逐步排序机制，这将提供新的洞察超声波的相转变，晶体生长和三维结晶的动态。

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  • 来源
    《Crystal growth & design》 |2018年第10期|共8页
  • 作者

    Li Yingxuan; Huang Mengmeng; Zang Ling; Jacobs Daniel L.; Zhao Jie; Zhu Yunqing; Wang Chuanyi;

  • 作者单位

    Shaanxi Univ Sci &

    Technol Sch Environm Sci &

    Engn Xian 710021 Shaanxi Peoples R China;

    Shaanxi Univ Sci &

    Technol Sch Environm Sci &

    Engn Xian 710021 Shaanxi Peoples R China;

    Univ Utah Nano Inst Utah Salt Lake City UT 84112 USA;

    Univ Utah Nano Inst Utah Salt Lake City UT 84112 USA;

    Shaanxi Univ Sci &

    Technol Sch Environm Sci &

    Engn Xian 710021 Shaanxi Peoples R China;

    Shaanxi Univ Sci &

    Technol Sch Environm Sci &

    Engn Xian 710021 Shaanxi Peoples R China;

    Shaanxi Univ Sci &

    Technol Sch Environm Sci &

    Engn Xian 710021 Shaanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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