Superionicity, disorder, and bandgap closure in dense hydrogen chloride.
Superionicity, disorder, and bandgap closure in dense hydrogen chloride.
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DOI:
10.1126/sciadv.abi9507
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发表时间:
2021-09-03
期刊:
影响因子:
13.6
通讯作者:
Dalladay-Simpson P
中科院分区:
文献类型:
--
作者:
Binns J;Hermann A;Peña-Alvarez M;Donnelly ME;Wang M;Kawaguchi SI;Gregoryanz E;Howie RT;Dalladay-Simpson P
Extreme pressure releases protons from highly compressed hydrogen bond networks. Hydrogen bond networks play a crucial role in biomolecules and molecular materials such as ices. How these networks react to pressure directs their properties at extreme conditions. We have studied one of the simplest hydrogen bond formers, hydrogen chloride, from crystallization to metallization, covering a pressure range of more than 2.5 million atmospheres. Following hydrogen bond symmetrization, we identify a previously unknown phase by the appearance of new Raman modes and changes to x-ray diffraction patterns that contradict previous predictions. On further compression, a broad Raman band supersedes the well-defined excitations of phase V, despite retaining a crystalline chlorine substructure. We propose that this mode has its origin in proton (H+) mobility and disorder. Above 100 GPa, the optical bandgap closes linearly with extrapolated metallization at 240(10) GPa. Our findings suggest that proton dynamics can drive changes in these networks even at very high densities.
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