Physical and mechanical properties of C60 under high pressures and high temperatures
Physical and mechanical properties of C60 under high pressures and high temperatures
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DOI：
10.1080/08957950600834792
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发表时间：
2006-09
影响因子：
2
通讯作者：
Wei-Chun Qiu;S. Chowdhury;R. Hammer;N. Velisavljevic;P. A. Baker;Y. Vohra
中科院分区：
文献类型：
--
作者：
Wei-Chun Qiu;S. Chowdhury;R. Hammer;N. Velisavljevic;P. A. Baker;Y. Vohra
The physical and mechanical properties of a C60 fullerene sample have been investigated under high pressure–high temperature conditions using a designer Diamond Anvil Cell. Electrical resistance measurements show evidence of C60 cage collapse at 20 GPa, which leads to the formation of an insulating phase at higher pressure. Energy dispersive X-ray diffraction (EDXD) data indicated that the characteristic fcc reflections gradually decrease in intensity and eventually disappear above 28 GPa. A C60 sample was laser-heated at a pressure of 35 GPa to a temperature of 1910±100 K and, subsequently, decompressed to ambient conditions. The photoluminescence spectra and the Raman spectrum of the pressure–temperature-treated sample were measured at a low temperature of 80 K. Raman peak at 1322.3 cm−1 with full-width half-maximum of 2.9 cm−1 was observed from the sample, which is attributed to the hexagonal diamond phase in the sample. The room temperature photoluminescence spectra showed a symmetric emission band centered in the red spectral range with a peak at 690 nm. The structural analysis of the pressure–temperature-processed C60 sample using EDXD method showed strong internal structure orientation and a phase close to hexagonal diamond. Mechanical properties such as hardness and Young’s modulus were measured by nanoindentation technique and the values were found to be 90±7 and 1215±50 GPa, respectively and these values are characteristic of sp3-bonded carbon materials.
