Q-carbon harder than diamond
Q-carbon harder than diamond
复制标题
Q-碳比金刚石还硬
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
E. Riedo
中科院分区：
文献类型：
--
作者：
J. Narayan;Siddharth Gupta;R. Sachan;A. Bhaumik;F. Cellini;E. Riedo
A new phase of carbon named Q-carbon is found to be over 40% harder than diamond. This phase is formed by nanosecond laser melting of amorphous carbon and rapid quenching from the super-undercooled state. Closely packed atoms in molten metallic carbon are quenched into Q-carbon with 80-85% sp ^3 and the rest sp ^2. The number density of atoms in Q-carbon can vary from 40% to 60% higher than diamond cubic lattice, as the tetrahedra packing efficiency increases from 70% to 80%. Using this semiempirical approach, the corresponding increase in Q-carbon hardness is estimated to vary from 48% to 70% compared to diamond.
