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Discontinuous phase diagram of amorphous carbons

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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/sp2 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(sp3/sp2)∝ pn,hints at intrinsic topology and hidden order in amorphous carbons,providing an insightful perspective to reacquaint atomic disorder in non-crystalline carbons.

amorphous carbonsdisordered carbonsphase diagrammicrostructural topologyphase transition

YinBo Zhu、ZhouYu Fang、ZhongTing Zhang、HengAn Wu

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CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China

State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

Youth Innovation Promotion Association CAS国家自然科学基金国家自然科学基金中央高校基本科研业务费专项Open Fund of Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education

20224651223201612172346WK2090000049NJ2022002INMD-2022M04

2024

10.1093/nsr/nwae051

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ISSN：
年,卷(期)：2024.11(4)
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