石墨
钻石
材料科学
碳纤维
劈理(地质)
结晶学
六方晶系
分析化学(期刊)
复合材料
化学
有机化学
复合数
断裂(地质)
作者
Liuxiang Yang,Kah Chun Lau,Zhidan Zeng,Dongzhou Zhang,Hu Tang,Yan Bing-Min,Huiyang Gou,Yanping Yang,Yuming Xiao,Derong Luo,Srilok Srinivasan,Subramanian K. R. S. Sankaranarayanan,Wenge Yang,Jianguo Wen,Ho‐kwang Mao
出处
期刊:Cornell University - arXiv
日期:2021-11-17
被引量:1
标识
DOI:10.48550/arxiv.2111.09176
摘要
Diamond is known as the hardest substance due to its ultra-strong tetrahedral sp3 carbon bonding framework. The only weak link is its cubic cleavage planes between (111) buckled honeycomb layers. Compressing graphite single crystals and heating to moderate temperatures, we synthesized a bulk, pure, hexagonal diamond (lonsdaleite) with distorted carbon tetrahedrons that shorten the bond between its hexagonal (001) buckled honeycomb layers, thus strengthening their linkage. We observed direct transformation of graphite (100) to lonsdaleite (002) and graphite (002) to lonsdaleite (100). We find the bulk lonsdaleite has superior mechanical properties of Vicker hardnesses HV = 164+/-11 GPa and 124+/-13 GPa, measured on the surface corresponding to the original graphite (001) and (100) surfaces, respectively. Properties of lonsdaleite as the supreme material can be further enhanced by purifying the starting material graphite carbon and fine-tuning the high pressure-temperature synthesis conditions.
科研通智能强力驱动
Strongly Powered by AbleSci AI