Discontinuous phase diagram of amorphous carbons  

作　　者：YinBo Zhu ZhouYu Fang ZhongTing Zhang HengAn Wu 

机构地区：[1]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China [2]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《National Science Review》2024年第4期158-165,共8页国家科学评论（英文版）

基　　金：This work was 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).

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/cm^(3)),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 sp^(3)/sp^(2) versus 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(sp^(3)/sp^(2))∝ρ^(n),hints at intrinsic topology and hidden order in amorphous carbons,providing an insightful perspective to reacquaint atomic disorder in non-crystalline carbons.

关 键 词：amorphous carbons disordered carbons phase diagram microstructural topology phase transition 

分 类 号：O613.71[理学—无机化学]