Revisiting local structural changes in GeO2 glass at high pressure

CORC > 化学研究所 > 中国科学院化学研究所 > 分子纳米结构与纳米技术实验室

	Revisiting local structural changes in GeO2 glass at high pressure
	Dong, Juncai 1; Yao, Hurong 2,3; Guo, Zhiying 1; Jia, Quanjie 1; Wang, Yan 1,2; An, Pengfei 1; Gong, Yu 1; Liang, Yaxiang 1; Chen, Dongliang 1
刊名	JOURNAL OF PHYSICS-CONDENSED MATTER
	2017-11-22
卷号	29 期号:46
关键词	High Pressure Polyamorphism Network-forming Glass Xafs
英文摘要	Despite the great importance in fundamental and industrial fields, understanding structural changes for pressure-induced polyamorphism in network-forming glasses remains a formidable challenge. Here, we revisited the local structural transformations in GeO2 glass up to 54 GPa using x-ray absorption fine structure (XAFS) spectroscopy via a combination diamond anvil cell and polycapillary half-lens. Three polyamorphic transitions can be clearly identified by XAFS structure refinement. First, a progressive increase of the nearest Ge-O distance and bond disorder to a maximum at similar to 5-16 GPa, in the same pressure region of previously observed tetrahedral-octahedral transformation. Second, a marked decrease of the nearest Ge-O distance at similar to 16-22.6 GPa but a slight increase at similar to 22.6-32.7 GPa, with a concomitant decrease of bond disorder. This stage can be related to a second-order-like transition from less dense to dense octahedral glass. Third, another decrease in the nearest Ge-O distance at similar to 32.7-41.4 GPa but a slight increase up to 54 GPa, synchronized with a gradual increase of bond disorder. This stage provides strong evidence for ultrahigh-pressure polyamorphism with coordination number >6. Furthermore, cooperative modification is observed in more distant shells. Those results provide a unified local structural picture for elucidating the polyamorphic transitions and densification process in GeO2 glass.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/41310]
专题	化学研究所_分子纳米结构与纳米技术实验室
作者单位	1.Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Inst High Energy Phys, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Dong, Juncai,Yao, Hurong,Guo, Zhiying,et al. Revisiting local structural changes in GeO2 glass at high pressure[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2017,29(46).
APA	Dong, Juncai.,Yao, Hurong.,Guo, Zhiying.,Jia, Quanjie.,Wang, Yan.,...&Chen, Dongliang.(2017).Revisiting local structural changes in GeO2 glass at high pressure.JOURNAL OF PHYSICS-CONDENSED MATTER,29(46).
MLA	Dong, Juncai,et al."Revisiting local structural changes in GeO2 glass at high pressure".JOURNAL OF PHYSICS-CONDENSED MATTER 29.46(2017).