Chin. Phys. Lett.  2001, Vol. 18 Issue (4): 577-578    DOI:
Original Articles |
X-Ray Diffraction Study of Carbon Nanotubes Under High Pressure
CHEN Liang-Chen;WANG Li-Jun;TANG Dong-Sheng;XIE Si-Shen;JIN Chang-Qing
Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
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CHEN Liang-Chen, WANG Li-Jun, TANG Dong-Sheng et al  2001 Chin. Phys. Lett. 18 577-578
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Abstract The structure and physical properties of carbon nanotubes have been investigated by using in situ high pressure energy dispersive x-ray diffraction with synchrotron radiation at pressures up to 50.7 GPa. At atmospheric pressure, the structure of carbon nanotubes is similar to the hexagonal close-packed lattice of graphite with the interplanar spacing of the diffraction line (002) d002 = 0.3404 nm and that of the line (100) d100 = 0.2116 nm. According to the high pressure x-ray diffraction results, the diffraction line (002) is broadened and weakened above 8 GPa, and carbon nanotubes become partly amorphous. When the pressures of 10 and 20 GPa are decreased down to zero, the diffraction line (002) is partly recovered. While at the maximum pressure of 50.7 GPa, they entirely become amorphous and this amorphous transition is irreversible. We used the equation of state of Birch-Murnaghan to fit the P-V data of carbon nanotubes and obtained the bulk modulus K0 = 54.3±3.2 GPa (at K'0 = 4.0).

Keywords: 62.50.+p      64.70.-p      61.10.-i     
Published: 01 April 2001
PACS:  62.50.+p  
  64.70.-p (Specific phase transitions)  
  61.10.-i  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2001/V18/I4/0577
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CHEN Liang-Chen
WANG Li-Jun
TANG Dong-Sheng
XIE Si-Shen
JIN Chang-Qing
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