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In situ atomic-scale observation of melting point suppression in nanometer-sized gold particles

机译:纳米金颗粒中熔点抑制的原位原子尺度观察

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Phase stabilities of nanometer-sized materials are quite different from those of thecorresponding bulk materials. Among the phase stabilities, melting point suppression is one of the most fundamentally important issues. In this work, real-time, atomic-scale direct observation of melting point suppression in nanometer-sized Au particles, along with simple in situ high resolution electron microscopy. Namely, it was confirmed in real space on an atomic scale that a solid-to-liquid transition occurred when the size of a particle, placed on a graphite substrate maintained at 1100 K, decreased to 5 nm during diminution. Furthermore, a monolayer-thick hole was formed on the substrate at the position of the liquid Au particle, probably due to carbon dissolution into the liquid Au particle.
机译:纳米材料的相稳定性与相应的块状材料有很大的不同。在相稳定性中,熔点抑制是最根本的重要问题之一。在这项工作中,实时,原子级直接观察纳米级Au颗粒中的熔点抑制作用,以及简单的原位高分辨率电子显微镜。即,证实了在真实空间中原子尺度上,当减小尺寸的石墨颗粒保持在1100 K的尺寸减小至5 nm时,发生了固液转变。此外,可能是由于碳溶解在液态Au颗粒中,在基板上的液态Au颗粒的位置上形成了单层厚的孔。

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