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<p>Various metastable ice phases and their complicated transition pathways have been found by pressurization at low temperatures at which slow kinetics and high metastability are easily achieved. By contrast, such diversity is less expected at room or elevated temperatures. Here, using a combination of a dynamic diamond anvil cell and X-ray free electron laser techniques, we demonstrate that supercompressed water transforms into ice VI through multiple freezing–melting pathways at room temperature, hidden within the pressure region of ice VI. These multiple transition pathways occur via a metastable ice (more specifically, ice XXI with body-centred tetragonal structure (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(I\bar{4}2d\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>I</mi> <mover accent="true"> <mn>4</mn> <mo>¯</mo> </mover> <mn>2</mn> <mi>d</mi> </mrow> </math></EquationSource> </InlineEquation>)) discovered in this study and a metastable ice VII that exists within the pressure range of ice VI. We find that supercompressed water structurally evolves from high-density water to very-high-density water, causing multiple transition pathways. These findings provide an insight to find more metastable ice phases and their transition pathways at elevated temperatures.</p>

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Multiple freezing–melting pathways of high-density ice through ice XXI phase at room temperature

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月10日

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  • Yun-Hee Lee,
  • Jin Kyun Kim,
  • Yong-Jae Kim,
  • Minju Kim,
  • Yong Chan Cho,
  • Rachel J. Husband,
  • Cornelius Strohm,
  • Emma Ehrenreich-Petersen,
  • Konstantin Glazyrin,
  • Torsten Laurus,
  • Heinz Graafsma,
  • Robert P. C. Bauer,
  • Felix Lehmkühler,
  • Karen Appel,
  • Zuzana Konôpková,
  • Minxue Tang,
  • Anand Prashant Dwivedi,
  • Jolanta Sztuck-Dambietz,
  • Lisa Randolph,
  • Khachiwan Buakor,
  • Oliver Humphries,
  • Carsten Baehtz,
  • Tobias Eklund,
  • Lisa Katharina Mohrbach,
  • Anshuman Mondal,
  • Hauke Marquardt,
  • Earl Francis O’Bannon,
  • Katrin Amann-Winkel,
  • Choong-Shik Yoo,
  • Ulf Zastrau,
  • Hanns-Peter Liermann,
  • Hiroki Nada,
  • Geun Woo Lee

摘要

Various metastable ice phases and their complicated transition pathways have been found by pressurization at low temperatures at which slow kinetics and high metastability are easily achieved. By contrast, such diversity is less expected at room or elevated temperatures. Here, using a combination of a dynamic diamond anvil cell and X-ray free electron laser techniques, we demonstrate that supercompressed water transforms into ice VI through multiple freezing–melting pathways at room temperature, hidden within the pressure region of ice VI. These multiple transition pathways occur via a metastable ice (more specifically, ice XXI with body-centred tetragonal structure ( \(I\bar{4}2d\) I 4 ¯ 2 d )) discovered in this study and a metastable ice VII that exists within the pressure range of ice VI. We find that supercompressed water structurally evolves from high-density water to very-high-density water, causing multiple transition pathways. These findings provide an insight to find more metastable ice phases and their transition pathways at elevated temperatures.