结晶
材料科学
化学物理
放松(心理学)
无定形固体
电介质
同步加速器
共价键
相(物质)
纳米技术
结晶学
热力学
化学
光电子学
光学
物理
有机化学
社会心理学
心理学
作者
Yudong Cheng,Qun Yang,Jiangjing Wang,Theodoros Dimitriadis,Mathias Schumacher,Huiru Zhang,Merlin Müller,Narges Amini,Fan Yang,Alexander Schökel,Julian Pries,Riccardo Mazzarello,Matthias Wuttig,Hai Bin Yu,Shuai Wei
标识
DOI:10.1038/s41467-022-35005-x
摘要
In glasses, secondary (β-) relaxations are the predominant source of atomic dynamics. Recently, they have been discovered in covalently bonded glasses, i.e., amorphous phase-change materials (PCMs). However, it is unclear what the mechanism of β-relaxations is in covalent systems and how they are related to crystallization behaviors of PCMs that are crucial properties for non-volatile memories and neuromorphic applications. Here we show direct evidence that crystallization is strongly linked to β-relaxations. We find that the β-relaxation in Ge15Sb85 possesses a high tunability, which enables a manipulation of crystallization kinetics by an order of magnitude. In-situ synchrotron X-ray scattering, dielectric functions, and ab-initio calculations indicate that the weakened β-relaxation intensity stems from a local reinforcement of Peierls-like distortions, which increases the rigidity of the bonding network and decreases the dynamic heterogeneity. Our findings offer a conceptually new approach to tuning the crystallization of PCMs based on manipulating the β-relaxations.
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