Nature of polyamorphic transformations in H2O under isothermal compression and decompression
Nature of polyamorphic transformations in H2O under isothermal compression and decompression
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等温压缩和减压下 H2O 中多晶形转变的性质
DOI：
10.1103/physrevmaterials.3.073404
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发表时间：
2019
影响因子：
3.4
通讯作者：
Kenney-Benson, Curtis
中科院分区：
文献类型：
--
作者：
Shen, Guoyin;Smith, Jesse S.;Kenney-Benson, Curtis
本文报道了用原位X射线衍射观察到的在150 K等温压缩和减压下的多晶转变。详细的结构信息之间的转换低，高，和非常高的密度无定形（LDA，HDA，和VHDA）揭示了机制，可逆性和（不）连续性的转换。在等温压缩过程中，多晶转变的特征在于尖锐的和可逆的LDA-VHDA转变，HDA样形式（称为HDA′）作为中间状态出现。LDA-VHDA转变过程分为两个步骤：LDA和HDA′低压端元之间的不连续转变，HDA′内部的连续变化，包括结构重构，最后收敛到VHDA. LDA和VHDA都是结构稳定的，主要表现为压缩（卸）压下的弹性行为，而HDA′是结构不稳定的。这些意见的低密度和高密度液体的可能关系进行了讨论。
We report polyamorphic transformations ofunder isothermal compression and decompression at 150 K, observed byin situx-ray diffraction. Detailed structural information across the transformations among low-, high-, and very-high-density amorphs (LDA, HDA, and VHDA) reveals the mechanisms, the reversibility, and (dis)continuity of the transformations. During isothermal (de)compression, the polyamorphic transformations are characterized by a sharp and reversible LDA-VHDA transformation, with an HDA-like form (referred to as HDA′) appearing as an intermediate state. The LDA-VHDA transformation is found to occur in two steps: a discontinuous transition between LDA and the end member of HDA′ on the low-pressure side, followed by a continuous change within HDA′ involving structural reconfigurations and finally converging to VHDA. Both LDA and VHDA are found to be structurally stable showing mainly elastic behavior under (de)compression, while HDA′ is structurally unstable. Possible relations of these observations to low- and high-density liquids are discussed.