Nanoindentation and x-ray diffraction studies of pressure-induced amorphization in C-70 fullerene

Journal Article · Mon Aug 07 04:00:00 EDT 2000 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1306913· OSTI ID:20217172

Patterson, Jeremy R ^[1]; Catledge, Shane A ^[1]; Vohra, Yogesh K ^[1]

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1. Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294-1170 (United States)

We have carried out high-pressure studies on a C-70 fullerene sample in a diamond anvil cell to 46 GPa at room temperature. Synchrotron energy dispersive x-ray diffraction studies were carried out to monitor the irreversible amorphization transformation followed by nanoindentation studies of the pressure-quenched samples. Micro-Raman studies indicate broad bands at 1570 and 1422 cm-1 indicative of an amorphous phase with a mixture of sp{sup 2}- and sp{sup 3}-bonded carbon. Nanoindentation studies on the quenched amorphous phase shows an elastic loading behavior with a hardness of 18 GPa, which is 2-3 times that of the surrounding steel gasket. Our results conclusively establish that the hard carbon phases can be produced from C-70 fullerene by application of pressure at room temperature. (c) 2000 American Institute of Physics.

• OSTI ID: 20217172
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 6 Vol. 77; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORTIZATION
EXPERIMENTAL DATA
FULLERENES
HARDNESS
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
RAMAN SPECTRA
VERY HIGH PRESSURE
X-RAY DIFFRACTION