Abstract
The ability to synthesize bulk diamond and diamond-like coatings from other forms of carbon, without the need for high pressures and temperatures, has long been of technological interest. Last year researchers at the Max Planck Institute in Stuttgart synthesized cubic diamond by focusing a beam of energetic neon ions onto carbon “onions” consisting of closed, concentric graphitic shells. The centre of the onion is transformed into cubic diamond, and the diamond core gradually grows under continuing irradiation. Michael Zaiser and Florian Banhart, also at Stuttgart, have now developed a theory to explain this phase transition (Phys. Rev. Lett. 1997 79 3680).
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