X-ray diffraction and nanoindentation studies of nanocrystalline graphite at high pressures

被引：30

作者：

Patterson, JR ^{[1
]}

Kudryavtsev, A ^{[1
]}

Vohra, YK ^{[1
]}

机构：

[1] Univ Alabama Birmingham, Dept Phys, Birmingham, AL 35294 USA

来源：

APPLIED PHYSICS LETTERS | 2002年 / 81卷 / 11期

关键词：

D O I：

10.1063/1.1508169

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report energy dispersive x-ray diffraction studies on nanocrystalline hexagonal graphite samples (average grain size=12 nm) in a diamond-anvil cell to 65 GPa at room temperature. A structural phase transition to a hexagonal diamond phase beginning at 15 GPa is completed at 55 GPa, and is reversible on decompression. The x-ray diffraction studies were followed by nanoindentation hardness measurements on the pressure treated samples. The obtained hardness values are in the range of 1-2 GPa. Unlike fullerenes, the room-temperature compression of nanocrystalline graphite to 65 GPa did not produce a superhard carbon material. (C) 2002 American Institute of Physics.

引用

页码：2073 / 2075

页数：3

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