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Fast in Situ Ultrahigh-Voltage Electron Microscopy Observation of Crystal Nucleation and Growth in Amorphous Antimony Nanoparticles
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-05-08 00:00:00 , DOI: 10.1021/acs.cgd.7b01626 Hidehiro Yasuda 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-05-08 00:00:00 , DOI: 10.1021/acs.cgd.7b01626 Hidehiro Yasuda 1
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Electron-irradiation-induced crystallization processes and the mechanisms in amorphous antimony nanoparticles have been investigated by microsecond temporal and picometer spatial resolution in situ observations. Electron irradiation experiments and the simultaneous in situ observations were carried out with an ultrahigh-voltage electron microscope operating at an accelerating voltage of 1 MV, which has a temporal resolution of 625 μs per frame. At the early stage of the crystallization in approximately 20 nm amorphous nanoparticles, a small crystal nucleus on the surface repeats between formation and annihilation. When the nucleus size becomes more than the critical size of 6.3 nm in diameter, crystal growth takes place in the whole nanoparticle. The crystal growth rate estimated was approximately 20 μm s–1. The growth rate depends on the particle size, and it was confirmed that the smaller the particle size, the faster the growth rate. It was suggested that the crystallization driven by long-range elastic interaction due to small crystal nucleus formation in amorphous nanoparticles is induced by short-range atomic rearrangements.
中文翻译：
非晶锑纳米粒子晶体成核与生长的快速原位超高压电子显微镜观察
通过微秒的时间和皮秒级空间分辨率原位观察，研究了电子辐照诱导的结晶过程以及非晶锑纳米颗粒中的机理。用超高压电子显微镜在1 MV的加速电压下进行电子辐照实验和同时进行的原位观察，该显微镜在1 MV的加速电压下工作，每帧的时间分辨率为625μs。在大约20 nm的无定形纳米粒子的结晶初期，表面上的小晶核在形成和and灭之间重复。当核尺寸变得大于直径的临界尺寸6.3 nm时，晶体生长就会在整个纳米颗粒中发生。晶体生长速率估计约为20μms –1。生长速率取决于颗粒尺寸，并且已经确认，颗粒尺寸越小，生长速率越快。有人提出，由于短程原子重排，在非晶态纳米颗粒中由于小晶核形成而由长程弹性相互作用驱动的结晶。
更新日期：2018-05-08
中文翻译：
非晶锑纳米粒子晶体成核与生长的快速原位超高压电子显微镜观察
通过微秒的时间和皮秒级空间分辨率原位观察，研究了电子辐照诱导的结晶过程以及非晶锑纳米颗粒中的机理。用超高压电子显微镜在1 MV的加速电压下进行电子辐照实验和同时进行的原位观察，该显微镜在1 MV的加速电压下工作，每帧的时间分辨率为625μs。在大约20 nm的无定形纳米粒子的结晶初期，表面上的小晶核在形成和and灭之间重复。当核尺寸变得大于直径的临界尺寸6.3 nm时，晶体生长就会在整个纳米颗粒中发生。晶体生长速率估计约为20μms –1。生长速率取决于颗粒尺寸，并且已经确认，颗粒尺寸越小，生长速率越快。有人提出，由于短程原子重排，在非晶态纳米颗粒中由于小晶核形成而由长程弹性相互作用驱动的结晶。
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