Formation of diamond in carbon onions under MeV ion irradiation
作者:
P. Wesolowski,
Y. Lyutovich,
F. Banhart,
H. D. Carstanjen,
H. Kronmu¨ller,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 71,
issue 14
页码: 1948-1950
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119990
出版商: AIP
数据来源: AIP
摘要:
Spherical carbon onions are generated by irradiating graphitic carbon soot withNe+ions of 3 MeV energy. Under continued irradiation, a transformation of their cores to cubic diamond crystals is observed. In comparison to earlier electron irradiation experiments, the yield of diamond is much higher. The output of the irradiation experiment is characterized by electron microscopy and electron energy loss spectroscopy. Knock-on displacements of carbon atoms byNe+ions are assumed to be responsible for a self-compression of the onions, leading to the nucleation of diamond in their cores. The increased diamond yield is explained by the higher displacement cross-section, the higher energy transfer, and the higher total beam current on the specimen. ©1997 American Institute of Physics.
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