Electrical and mechanical properties of C70 fullerene and graphite under high pressures studied using designer diamond anvils

被引：81

作者：

Patterson, JR ^{[1
]}

Catledge, SA

Vohra, YK

Akella, J

Weir, ST

机构：

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

[2] LLNL, Livermore, CA 94550 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 25期

关键词：

Electric properties - Electronic density of states - Fermi level - Graphite - Indentation - Lithography - Mechanical properties - Phase transitions - Photoluminescence - Synthesis (chemical) - Temperature - X ray diffraction analysis;

D O I：

10.1103/PhysRevLett.85.5364

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We compare electrical and mechanical properties of C-70 fullerene with high purity graphite to 48 GPa at room temperature using designer diamond anvils with embedded electrical microprobes. The electrical resistance of C-70 shows a minimum at 20 GPa with transformation to an amorphous insulating phase complete above 35 GPa, while graphite remains conducting. Nanoindentation shows hardness values 220 times larger for the pressure quenched amorphous phase than for similarly treated graphite. Our studies establish that the amorphous carbon phase produced from C-70 has unique properties not attainable from graphite.

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页码：5364 / 5367

页数：4

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