Successive disorder to disorder phase transitions in ionic liquid [HMIM][BF4] under high pressure

	Successive disorder to disorder phase transitions in ionic liquid [HMIM][BF4] under high pressure
	Zhu, Xiang 1,2; Yuan, Chaosheng 2; Li, Haining 2; Zhu, Pinwen 1; Su, Lei 2,3; Yang, Kun 2; Wu, Jie 2; Yang, Guoqiang 3; Liu, Jing 4
刊名	JOURNAL OF MOLECULAR STRUCTURE
	2016-02-15
卷号	1106 页码:70-75
关键词	Ionic liquid Raman spectroscopy Synchrotron X-ray diffraction
英文摘要	In situ high-pressure Raman spectroscopy and synchrotron X-ray diffraction have been employed to investigate the phase behavior of ionic liquid, 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM] [BF4]) under high pressure up to 20 GPa at room temperature. With increasing pressure, some characteristic bands of (1-HMIM][BF4] disappear, and some characteristic bands of [HMIM][BF4] display non-monotonic pressure-induced frequency shift and non-monotonic variation of full width at half-maximum. Two successive phase transitions at similar to 1.7 GPa and 73 GPa have been corroborated by the results above. The glass transition pressure (P-g) of [HMIM][BF4] at similar to 7.3 GPa has been obtained by ruby R-1 line broadening measurements and analysis of synchrotron X-ray diffraction patterns, and its glass transition mechanism is also analyzed in detail. These facts are suggestive of two successive disorder to disorder phase transitions induced by compression, that is, [HMIM][BF4] serves as a superpressurized glass under the pressure above 73 GPa, which is similar to the glassy state at low temperature, and a compression-induced liquid to liquid phase transition in [HMIM][BF4] occurs at similar to 1.7 GPa. Besides, the conformational equilibrium of the GAAA conformer and AAAA conformer was converted easily in liquid [HMIM][BF4], while it was difficult to be influenced in glassy state. (C) 2015 Elsevier B.V. All rights reserved.
收录类别	SCI
语种	英语
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/29579]
专题	化学研究所_光化学实验室
作者单位	1.Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China 2.Zhengzhou Univ Light Ind, High Pressure Res Ctr Sci & Technol, Zhengzhou 450002, Peoples R China 3.Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing 100080, Peoples R China 4.Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Xiang,Yuan, Chaosheng,Li, Haining,et al. Successive disorder to disorder phase transitions in ionic liquid [HMIM][BF4] under high pressure[J]. JOURNAL OF MOLECULAR STRUCTURE,2016,1106:70-75.
APA	Zhu, Xiang.,Yuan, Chaosheng.,Li, Haining.,Zhu, Pinwen.,Su, Lei.,...&Liu, Jing.(2016).Successive disorder to disorder phase transitions in ionic liquid [HMIM][BF4] under high pressure.JOURNAL OF MOLECULAR STRUCTURE,1106,70-75.
MLA	Zhu, Xiang,et al."Successive disorder to disorder phase transitions in ionic liquid [HMIM][BF4] under high pressure".JOURNAL OF MOLECULAR STRUCTURE 1106(2016):70-75.