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Graphane sheets and crystals under pressure

delete2011-04-08
delete126
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OA
AI
温
温晓东 (Xiaodong Wen)
L
Louis N. Hand
V
Vanessa Labet
杨涛 封面图
杨涛 (Tao Yang)
R
Roald Hoffmann *
N
N. W. Ashcroft
A
Artem R. Oganov
A
Andriy O. Lyakhov
DOI:10.1073/pnas.1103145108delete
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摘要

摘要

En 中文
Eight isomeric two-dimensional graphane sheets are found in a theoretical study. Four of these nets-two built on chair cyclohexanes, two on boat-are more stable thermodynamically than the isomeric benzene, or polyacetylene. Three-dimensional crystals are built up from the two-dimensional sheets, and their hypothetical behavior under pressure (up to 300 GPa) is explored. While the three-dimensional graphanes remain, as expected, insulating or semiconducting in this pressure range, there is a remarkable inversion in stability of the five crystals studied. Two stacking polytypes that are not the most stable at ambient pressure (one based on an unusual chair cyclohexane net, the other on a boat) are significantly stabilized with increasing pressure relative to stackings of simple chair sheets. The explanation may lie in the balance on intra and intersheet contacts in the extended arrays.
Keyword:
benzene isomers
high pressure
structural searching
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期刊

P
Proceedings of the National Academy of Sciences of the United States of America
IF:
9.1
论文数:
10.8W
被引数:
73.5W

机构

S
state university of new york (suny) system
学者数:
6.5W
论文数: 5.8W
被引数: 65
C
Cornell University
学者数:
6.3W
论文数: 5.4W
被引数: 10.9W
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