Studies of Defects and Electronic Momentums in Graphite and Nanocrystalline Carbon

DENG  Wen; ZHOU Yin-e; ZHU Ying-ying; HUANG  Yu-yang; LIU Qi-xiu; XIONG  Liang-yue

doi:10.11804/NuclPhysRev.22.01.050

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Article Navigation > Nuclear Physics Review > 2005 > 22(1): 50-53

DENG Wen, ZHOU Yin-e, ZHU Ying-ying, HUANG Yu-yang, LIU Qi-xiu, XIONG Liang-yue. Studies of Defects and Electronic Momentums in Graphite and Nanocrystalline Carbon[J]. Nuclear Physics Review, 2005, 22(1): 50-53. doi: 10.11804/NuclPhysRev.22.01.050

Citation:

DENG Wen, ZHOU Yin-e, ZHU Ying-ying, HUANG Yu-yang, LIU Qi-xiu, XIONG Liang-yue. Studies of Defects and Electronic Momentums in Graphite and Nanocrystalline Carbon[J]. Nuclear Physics Review, 2005, 22(1): 50-53. doi: 10.11804/NuclPhysRev.22.01.050

Studies of Defects and Electronic Momentums in Graphite and Nanocrystalline Carbon

doi: 10.11804/NuclPhysRev.22.01.050

1 Department of Physics, Guangxi University, Nanning 530004, China)(2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2005-03-20

Abstract

The defects and electronic momenta in graphite and nanocrystalline carbon have been studied by positron annihilation techniques. The results show that the concentration and open volume of defects in nanocrystalline carbon are higher/larger than that in graphite. Two kinds of microdefects were found in the nanocrystalline carbon: free volume (with a size of smaller than that of a monovacancy) and microvoids (with a size of about ten monovacancies). The anisotropic distribution of electronic momentum was found in single crystalline graphite, the momentum of free electron shows a maximum value in \[0001\] direction, and decreases with the increase of the angle deviation from \[0001\] direction and then reaches a minimum value in the direction perpendicular to \[0001\]. However, this phenomenon was not found in nanocrystalline carbon since the distribution of electronic momentum is isotropic.
- positron annihilation,
- graphite,
- nanocrystalline carbon,
- defect,
- electronic momentum
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Studies of Defects and Electronic Momentums in Graphite and Nanocrystalline Carbon

doi: 10.11804/NuclPhysRev.22.01.050

1 Department of Physics, Guangxi University, Nanning 530004, China)(2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2005-03-20

Key words:

Abstract: The defects and electronic momenta in graphite and nanocrystalline carbon have been studied by positron annihilation techniques. The results show that the concentration and open volume of defects in nanocrystalline carbon are higher/larger than that in graphite. Two kinds of microdefects were found in the nanocrystalline carbon: free volume (with a size of smaller than that of a monovacancy) and microvoids (with a size of about ten monovacancies). The anisotropic distribution of electronic momentum was found in single crystalline graphite, the momentum of free electron shows a maximum value in \[0001\] direction, and decreases with the increase of the angle deviation from \[0001\] direction and then reaches a minimum value in the direction perpendicular to \[0001\]. However, this phenomenon was not found in nanocrystalline carbon since the distribution of electronic momentum is isotropic.

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