中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Chemical influence on beta-relaxations and the formation of molecule-like metallic glasses

文献类型:期刊论文

作者Yu, HB ; Samwer, K ; Wang, WH ; Bai, HY
刊名NATURE COMMUNICATIONS
出版日期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
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
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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).

入库方式: OAI收割

来源:物理研究所

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