Pulsed-laser-induced transformation path of graphite to diamond via an intermediate rhombohedral graphite |
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| Authors: | GW Yang JB Wang |
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| Institution: | (1) Department of Physics, Xiangtan University, Xiangtan 411105, P.R. China, CN;(2) Department of Material Science and Engineering, Tsinghua University, Beijing 100084, P.R. China, CN |
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| Abstract: | The new phase transformation of hexagonal graphite to cubic diamond was experimentally produced without catalyst, using a
high-power pulsed laser. Interestingly, by the X-ray diffraction spectra, it was proved that this transition was not direct,
but through an intermediate rhombohedral phase. Furthermore, it is important that the rhombohedral phase, as the theoretical
transformation path of hexagonal graphite to cubic diamond, was first truly substantiated by our experimental results. The
transformation mechanism was suggested that diamond with hexagonal structure was obtained by the direct transforming of hexagonal
graphite to hexagonal diamond, and diamond with cubic structure was formed by the indirect transforming, i.e., hexagonal graphite
to rhombohedral graphite to cubic diamond.
Received: 7 February 2000 / Accepted: 28 March 2000 / Published online: 9 November 2000 |
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| Keywords: | PACS: 42 62 -b 81 05 Tp 81 30 Dz |
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