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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >High density amorphous ice at room temperature
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High density amorphous ice at room temperature

机译：室温下高密度无定形冰

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摘要

The phase diagram of water is both unusual and complex, exhibiting a wide range of polymorphs including proton-ordered or disordered forms. In addition, a variety of stable and metastable forms are observed. The richness of H2O phases attests the versatility of hydrogen-bonded network structures that include kineti-cally stable amorphous ices. Information of the amorphous solids, however, is rarely available especially for the stability field and transformation dynamics-but all reported to exist below the crystallization temperature of approximately 150-170 K below 4-5 GPa. Here, we present the evidence of high density amorphous (HDA) ice formed well above the crystallization temperature at 1 GPa-well inside the so-called "no-man's land." It is formed from metastable ice VII in the stability field of ice VI under rapid compression using dynamic-diamond anvil cell (d-DAC) and results from structural similarities between HDA and ice VII. The formation follows an interracial growth mechanism unlike the melting process. Nevertheless, the occurrence of HDA along the extrapolated melt line of ice VII resembles the ice Ih-to-HDA transition, indicating that structural instabilities of parent ice VII and Ih drive the pressure-induced amorphization.
机译：水的相图既异常又复杂，表现出多种多晶型，包括质子有序或无序形式。另外，观察到多种稳定和亚稳态形式。 H2O相的丰富性证明了氢键网络结构的多功能性，其中包括运动稳定的无定形冰。然而，关于稳定领域和转变动力学，很少有无定形固体的信息，但据报道所有这些都存在于低于4-5 GPa的约150-170 K的结晶温度下。在这里，我们提供了高密度非晶（HDA）冰的证据，该冰远高于所谓的“无人区”内1 GPa井的结晶温度。它是使用动态金刚石砧座细胞（d-DAC）在快速压缩的条件下在冰VI的稳定区域中由亚稳冰VII形成的，并且是HDA与冰VII之间结构相似的结果。与熔融过程不同，地层遵循种族增长机制。然而，沿着冰VII的外推熔解线出现的HDA类似于冰从Ih到HDA的转变，表明母冰VII和Ih的结构不稳定性驱动了压力诱导的非晶化。

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