Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 118, Issue 4, Pages 1138-1145Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp409924h
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Funding
- Photon Factory Research Project [2010G546]
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We have found that the room-temperature ionic liquid (RTIL) reveals outstanding pressure-induced phase changes from a liquid state to a crystal polymorph and finally to a glass form upon compression by up to 8 GPa. The RTIL is 1-butyl-3-methylimidazolium hexafluorophosphate, [C(4)mim][PF6], which offers the opportunity to investigate a variety of fluctuations in one system and can be completely recovered without dissociation or polymerization, even after decompression. Similar to charge frustration, spin ice-like frustration, and geometric frustration in high potential spintronics/multiferroic materials, the RTIL frustrations are classified into charge (scalar), orientation (vector), and coordination number (topology). Degrees of freedom at each state of [C(4)mim][PF6] are described by charge balancing, molecular orientational order/disorder, molecular conformations of the C(4)miin(+) cation, and the coordination number. Here, we show a novel conformation glass induced by high pressure.
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