Chemical influence on beta-relaxations and the formation of molecule-like metallic glasses

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	Chemical influence on beta-relaxations and the formation of molecule-like metallic glasses
	Yu, HB ; Samwer, K ; Wang, WH ; Bai, HY
刊名	NATURE COMMUNICATIONS
	2013
卷号	4
ISSN号	2041-1723
通讯作者	Samwer, K (reprint author), Univ Gottingen, Inst Phys, D-37077 Gottingen, Germany.
中文摘要	Secondary (also known as Johari-Goldstein or beta-) relaxations are an intrinsic feature of supercooled liquids and glasses. They are important in many respects but the underlying mechanisms are not well understood. A long-standing puzzle is why some glasses show beta-relaxations as pronounced peaks, whereas others as unobvious excess wings. Here we demonstrate that these different behaviours are related to the fluctuations of chemical interactions by using prototypical systems of metallic glasses. A general rule is summarized: pronounced beta-relaxations are associated with systems where all the atomic pairs have large similar negative values of enthalpy of mixing, whereas positive or significant fluctuations in enthalpy of mixing suppress beta-relaxations. The emerging physical picture is that strong and comparable interactions among all the constituting atoms maintain string-like atomic configurations for the excitations of beta-events and can be considered as the formation of molecule-like metallic glasses.
资助信息	Alexander von Humboldt Foundation; German Science Foundation [FOR 1394]; Leibniz-Program [Sa 337/10-1]; NSF of China [51271195]
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/56813]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Yu, HB,Samwer, K,Wang, WH,et al. Chemical influence on beta-relaxations and the formation of molecule-like metallic glasses[J]. NATURE COMMUNICATIONS,2013,4.
APA	Yu, HB,Samwer, K,Wang, WH,&Bai, HY.(2013).Chemical influence on beta-relaxations and the formation of molecule-like metallic glasses.NATURE COMMUNICATIONS,4.
MLA	Yu, HB,et al."Chemical influence on beta-relaxations and the formation of molecule-like metallic glasses".NATURE COMMUNICATIONS 4(2013).