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Pressure-induced liquid-liquid transition in a family of ionic materials

Author

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  • Zaneta Wojnarowska

    (the University of Silesia in Katowice, Silesian Center for Education and Interdisciplinary Research)

  • Shinian Cheng

    (the University of Silesia in Katowice, Silesian Center for Education and Interdisciplinary Research
    University of Wisconsin-Madison)

  • Beibei Yao

    (the University of Silesia in Katowice, Silesian Center for Education and Interdisciplinary Research)

  • Malgorzata Swadzba-Kwasny

    (The Queen’s University of Belfast)

  • Shannon McLaughlin

    (The Queen’s University of Belfast)

  • Anne McGrogan

    (The Queen’s University of Belfast)

  • Yoan Delavoux

    (The Queen’s University of Belfast)

  • Marian Paluch

    (the University of Silesia in Katowice, Silesian Center for Education and Interdisciplinary Research)

Abstract

Liquid−liquid transition (LLT) between two disordered phases of single-component material remains one of the most intriguing physical phenomena. Here, we report a first-order LLT in a series of ionic liquids containing trihexyl(tetradecyl)phosphonium cation [P666,14]+ and anions of different sizes and shapes, providing an insight into the structure-property relationships governing LLT. In addition to calorimetric proof of LLT, we report that ion dynamics exhibit anomalous behavior during the LLT, i.e., the conductivity relaxation times (τσ) are dramatically elongated, and their distribution becomes broader. This peculiar behavior is induced by isobaric cooling and isothermal compression, with the τσ(TLL,PLL) constant for a given system. The latter observation proves that LLT, in analogy to liquid-glass transition, has an isochronal character. Finally, the magnitude of discontinuity in a specific volume at LLT was estimated using the Clausius-Clapeyron equation.

Suggested Citation

  • Zaneta Wojnarowska & Shinian Cheng & Beibei Yao & Malgorzata Swadzba-Kwasny & Shannon McLaughlin & Anne McGrogan & Yoan Delavoux & Marian Paluch, 2022. "Pressure-induced liquid-liquid transition in a family of ionic materials," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29021-0
    DOI: 10.1038/s41467-022-29021-0
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    References listed on IDEAS

    as
    1. Wei Xu & Magdalena T. Sandor & Yao Yu & Hai-Bo Ke & Hua-Ping Zhang & Mao-Zhi Li & Wei-Hua Wang & Lin Liu & Yue Wu, 2015. "Evidence of liquid–liquid transition in glass-forming La50Al35Ni15 melt above liquidus temperature," Nature Communications, Nature, vol. 6(1), pages 1-9, November.
    2. Ivan Saika-Voivod & Peter H. Poole & Francesco Sciortino, 2001. "Fragile-to-strong transition and polyamorphism in the energy landscape of liquid silica," Nature, Nature, vol. 412(6846), pages 514-517, August.
    3. Kaori Ito & Cornelius T. Moynihan & C. Austen Angell, 1999. "Thermodynamic determination of fragility in liquids and a fragile-to-strong liquid transition in water," Nature, Nature, vol. 398(6727), pages 492-495, April.
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