Discontinuous phase diagram of amorphous carbons

作     者：YinBo Zhu ZhouYu Fang ZhongTing Zhang HengAn Wu YinBo Zhu;ZhouYu Fang;ZhongTing Zhang;HengAn Wu

作者机构：CAS Key Laboratory of Mechanical Behavior and Design of MaterialsDepartment of Modern MechanicsUniversity of Science and Technology of China State Key Laboratory of Nonlinear MechanicsInstitute of Mechanics Chinese Academy of Sciences 

出 版 物：《National Science Review》 (国家科学评论(英文版))

年 卷 期：2024年第11卷第4期

页      面：164-171页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by the Youth Innovation Promotion Association CAS (2022465) the National Natural Science Foundation of China (12232016 and 12172346) Fundamental Research Funds for the Central Universities (WK2090000049) the Open Fund of Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education NJ2022002 (INMD-2022M04) 

主　　题：amorphous carbons disordered carbons phase diagram microstructural topology phase transition 

摘      要：The short-range order and medium-range order of amorphous carbons demonstrated in experiments allow us to rethink whether there exist intrinsic properties hidden by atomic disordering. Here we presented six representative phases of amorphous carbons（0.1–3.4 g/cm3）, namely, disordered graphene network（DGN）, high-density amorphous carbon（HDAC）, amorphous diaphite（a-DG）, amorphous diamond（a-D）, paracrystalline diamond（p-D）, and nano-polycrystalline diamond（NPD）, respectively, classified by their topological features and microstructural characterizations that are comparable with experiments. To achieve a comprehensive physical landscape for amorphous carbons, a phase diagram was plotted in the sp3/sp2versus density plane, in which the counterintuitive discontinuity originates from the inherent difference in topological microstructures, further guiding us to discover a variety of phase transitions among different amorphous carbons. Intriguingly, the power law, log（sp3/sp2） ∝ ρn, hints at intrinsic topology and hidden order in amorphous carbons, providing an insightful perspective to reacquaint atomic disorder in non-crystalline carbons.