Direct evidence of the proton-dynamics crossover in ice VII from high-pressure dielectric measurements beyond 10 GPa
Direct evidence of the proton-dynamics crossover in ice VII from high-pressure dielectric measurements beyond 10 GPa
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超过 10 GPa 的高压介电测量表明冰 VII 中质子动力学交叉的直接证据
DOI：
10.1103/physrevb.104.214304
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发表时间：
2021
影响因子：
3.7
通讯作者：
Kagi Hiroyuki
中科院分区：
文献类型：
--
作者：
Yamane Ryo;Komatsu Kazuki;Kagi Hiroyuki
我们在高达 12.2 GPa 的压力下对冰 VII 进行了介电测量，并使用新开发的高压单元验证了在约 10 GPa 下从分子旋转到质子平移的主导动力学变化。根据交叉点在 9 和 10 GPa 之间的两个运动的弛豫时间，我们表明冰 VII 中无序状态的变化可以通过运动的时间尺度来表征。我们的结果为 VII 号冰在 10 GPa 左右的异常行为这一长期存在的问题提供了合适的解释。
We have conducted dielectric measurements of ice VII at pressures up to 12.2 GPa, and verified a dominant-dynamics change from a molecular rotation to a proton translation at approximately 10 GPa, using a newly developed high-pressure cell. Based on relaxation times of the two motions, which have a crossover point between 9 and 10 GPa, we show that the change in the disordered states in ice VII can be characterized by the time scale of the motions. Our results provide a suitable explanation of the long-standing problem of the anomalous behavior of ice VII at around 10 GPa.