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Successive disorder to disorder phase transitions in ionic liquid [HMIM][BF4] under high pressure
Zhu, X; Yuan, CS; Li, HN; Zhu, PW; Su, L; Yang, K; Wu, J; Yang, GQ; Liu, J; Liu J(刘景)
AbstractIn 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.
KeywordIonic liquid Raman spectroscopy Synchrotron X-ray diffraction
Indexed BySCI ; ADS
WOS IDWOS:000367482700010
ADS Bibcode2016JMoSt1106...70Z
ADS URLhttps://ui.adsabs.harvard.edu/abs/2016JMoSt1106...70Z
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2016JMoSt1106...70Z/citations
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Cited Times:4 [ADS]
Document Type期刊论文
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GB/T 7714
Zhu, X,Yuan, CS,Li, HN,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, X.,Yuan, CS.,Li, HN.,Zhu, PW.,Su, L.,...&刘景.(2016).Successive disorder to disorder phase transitions in ionic liquid [HMIM][BF4] under high pressure.JOURNAL OF MOLECULAR STRUCTURE,1106,70-75.
MLA Zhu, X,et al."Successive disorder to disorder phase transitions in ionic liquid [HMIM][BF4] under high pressure".JOURNAL OF MOLECULAR STRUCTURE 1106(2016):70-75.
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