Science. 1991 Aug 16;253(5021):772-4. doi: 10.1126/science.253.5021.772.
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.
两种形式的碳经过快速冷却技术从石墨片淬火而来，这些石墨片在冲击压缩到 650 吉帕斯卡和 3700K 时被压缩。一种形式是“纳米金刚石”，它是从冷却最快的部分获得的，其晶体结构接近于立方金刚石。另一种形式是在相对缓慢冷却的部分发现的，类似于离子束技术制备的 i 型碳。纳米金刚石被解释为一种亚稳态形式，与通过马氏体相变从石墨转化而来的六方金刚石相同，其区域或路径可能与六方金刚石不同。第二种形式是通过重构产生的。
