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Articles
Modified Phases of Diamond Formed Under Shock Compression and Rapid Quenching
1 Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 227, Japan
Two modified forms of carbon were quenched by a rapid-cooling technique from graphite sheets shock-compressed to 65 gigapascals and 3700 K. One form, ``n-diamond," which was obtained from the most rapidly cooled part, has a crystal structure close to that of cubic diamond. The other form, found in the relatively slow-cooled part, was comparable to an i-carbon prepared by an ion-beam technique. The n-diamond is interpreted as a metastable form, the same as hexagonal diamond, converted from graphite through a martensitic transition, for which either the region or the path may be different from that of hexagonal diamond. The second form was found to be produced through reconstruction. Submitted on March 21, 1991Accepted on June 5, 1991
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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