Hierarchical densification and negative thermal expansion in Ce-based metallic glass under high pressure

	Hierarchical densification and negative thermal expansion in Ce-based metallic glass under high pressure
	Luo, Q; Garbarino, GT; Sun, BA; Fan, DW; Zhang, Y; Wang, Z; Sun, YJ; Jiao, J; Li, XD; Li, PS
刊名	NATURE COMMUNICATIONS
	2015
卷号	6 页码:5703
英文摘要	The polyamorphsim in amorphous materials is one of the most fascinating topics in condensed matter physics. In amorphous metals, the nature of polyamorphic transformation is poorly understood. Here we investigate the structural evolution of a Ce-based metallic glass (MG) with pressure at room temperature (RT) and near the glass transition temperature by synchrotron X-ray diffraction, uncovering novel behaviours. The MG shows hierarchical densification processes at both temperatures, arising from the hierarchy of interatomic interactions. In contrast with a continuous and smooth process for the low- to medium-density amorphous state transformation at RT, a relatively abrupt and discontinuous transformation around 5.5 GPa is observed at 390 K, suggesting a possible weak first-order nature. Furthermore, both positive and abnormal-negative thermal expansion behaviours on medium-range order are observed in different pressure windows, which could be related to the low-energy vibrational motions and relaxation of the weakly linked solute-centred clusters.
学科主题	Science & Technology - Other Topics
类目[WOS]	Multidisciplinary Sciences
收录类别	SCI
WOS记录号	WOS:000350034400001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228115]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Luo, Q,Garbarino, GT,Sun, BA,et al. Hierarchical densification and negative thermal expansion in Ce-based metallic glass under high pressure[J]. NATURE COMMUNICATIONS,2015,6:5703.
APA	Luo, Q.,Garbarino, GT.,Sun, BA.,Fan, DW.,Zhang, Y.,...&李鹏善.(2015).Hierarchical densification and negative thermal expansion in Ce-based metallic glass under high pressure.NATURE COMMUNICATIONS,6,5703.
MLA	Luo, Q,et al."Hierarchical densification and negative thermal expansion in Ce-based metallic glass under high pressure".NATURE COMMUNICATIONS 6(2015):5703.