From fullerenes to diamond

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Bulletin of the American Physical Society

OSTI ID:127766

Nunez Regueiro, M; Hodeau, J L; Bethoux, O ^[1]

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1. CNRS, Grenoble (France); and others

The behaviour of fullerenes C{sub 60}, C{sub 70} and C{sub 60}I{sub 4} under pressure has been studied. Their electrical resistivity follows a 3-D variable range hopping behaviour at low pressures. A transition to a less conducting state has been observed at pressures higher than 15 GPa. In the case of C{sub 60} or C{sub 60}-C{sub 70} mixtures attempts of stabilizing the high pressure phase have resulted in the collapse of the fullerene structure to polycrystalline diamond or amorphous carbon, depending on the pressure and on the conditions of hydrostaticity. This is the first time that any carbon phase transforms to diamond at room temperature, suggesting a potential application to industrial diamond synthesis. The nature of the obtained amorphous carbon phase, possibly sp{sup 3} in nature, is discussed.

• OSTI ID: 127766
• Report Number(s): CONF-920376--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 37; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DIAMONDS
ELECTRIC CONDUCTIVITY
FULLERENES
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE