Compression of polyhedral graphite up to 43 GPa and x-ray diffraction study on elasticity and stability of the graphite phase
Compression of polyhedral graphite up to 43 GPa and x-ray diffraction study on elasticity and stability of the graphite phase
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DOI：
10.1063/1.1763641
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发表时间：
2004-06
影响因子：
4
通讯作者：
A. Nakayama;S. Iijima;Y. Koga;K. Shimizu;K. Hirahara;F. Kokai
中科院分区：
文献类型：
--
作者：
A. Nakayama;S. Iijima;Y. Koga;K. Shimizu;K. Hirahara;F. Kokai
本文用X射线粉末衍射方法研究了多面体石墨颗粒（G球）在43GPa压力和室温下的晶体结构。多面体在高于40 GPa的压力下保持石墨相。在43 GPa下，29%的体积压缩涉及25%的层间距离的不寻常减小。多面体通过释放压力恢复其原始晶体结构。多面体的封闭和固体结构，抑制了向另一相的转变，使它们在高于20 GPa的压力下变成金属。
The crystal structure of polyhedral graphite particles (“G balls”) has been investigated under pressure up to 43 GPa and at room temperature by x-ray powder diffraction measurements. The polyhedra maintain the graphite phase under pressure higher than 40 GPa. A 29% compression in volume at 43 GPa involves an unusual decrease in the interlayer distance of 25%. The polyhedra recover their original crystal structure by releasing the pressure. A closed and solid structure of the polyhedra, suppressing a transition into another phase, causes them to become metallic under pressures higher than 20 GPa.