Reversible disorder-order transitions in atomic crystal nucleation

doi:10.1126/science.aaz7555

GSTDTAP > 气候变化

DOI	10.1126/science.aaz7555
	Reversible disorder-order transitions in atomic crystal nucleation
	Sungho Jeon; Taeyeong Heo; Sang-Yeon Hwang; Jim Ciston; Karen C. Bustillo; Bryan W. Reed; Jimin Ham; Sungsu Kang; Sungin Kim; Joowon Lim; Kitaek Lim; Ji Soo Kim; Min-Ho Kang; Ruth S. Bloom; Sukjoon Hong; Kwanpyo Kim; Alex Zettl; Woo Youn Kim; Peter Ercius; Jungwon Park; Won Chul Lee
	2021-01-29
发表期刊	Science
出版年	2021
英文摘要	In classic nucleation theory, a metastable disordered dense liquid or amorphous solid cluster spontaneously and irreversibly transforms into a crystalline nucleus. Jeon et al. observed the formation of gold crystals on a graphene substrate through the reduction of a precursor using an electron beam. Rather than the classic view, they instead observed a nucleation pathway that involves dynamic and reversible fluctuations of developing nuclei between disordered and crystalline states. The lifetime in the disordered state decreases with increasing cluster size, and at sufficiently small sizes, the binding energy per atom is large enough relative to the energy required to induce melting that the heat imparted upon binding is enough to drive partial collapse of an ordered cluster into the disordered state. Science , this issue p. [498][1] Nucleation in atomic crystallization remains poorly understood, despite advances in classical nucleation theory. The nucleation process has been described to involve a nonclassical mechanism that includes a spontaneous transition from disordered to crystalline states, but a detailed understanding of dynamics requires further investigation. In situ electron microscopy of heterogeneous nucleation of individual gold nanocrystals with millisecond temporal resolution shows that the early stage of atomic crystallization proceeds through dynamic structural fluctuations between disordered and crystalline states, rather than through a single irreversible transition. Our experimental and theoretical analyses support the idea that structural fluctuations originate from size-dependent thermodynamic stability of the two states in atomic clusters. These findings, based on dynamics in a real atomic system, reshape and improve our understanding of nucleation mechanisms in atomic crystallization. [1]: /lookup/doi/10.1126/science.aaz7555
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/314014
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Sungho Jeon,Taeyeong Heo,Sang-Yeon Hwang,et al. Reversible disorder-order transitions in atomic crystal nucleation[J]. Science,2021.
APA	Sungho Jeon.,Taeyeong Heo.,Sang-Yeon Hwang.,Jim Ciston.,Karen C. Bustillo.,...&Won Chul Lee.(2021).Reversible disorder-order transitions in atomic crystal nucleation.Science.
MLA	Sungho Jeon,et al."Reversible disorder-order transitions in atomic crystal nucleation".Science (2021).