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Updated: Jul 12, 2025

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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Double-Shock Compression Pathways from Diamond to BC8 Carbon.

Jiuyang Shi1, Zhixing Liang1, Junjie Wang1

  • 1National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.

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|October 20, 2023
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Summary
This summary is machine-generated.

Scientists achieved the elusive BC8 carbon phase using a novel double shock compression method. This breakthrough, enabled by machine learning, opens new avenues for exploring carbon

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Area of Science:

  • Materials Science
  • High-Pressure Physics
  • Computational Chemistry

Background:

  • Carbon's significance spans diverse scientific fields.
  • The BC8 carbon phase has been theoretically predicted but experimentally unconfirmed for decades.
  • Previous experimental efforts to synthesize BC8 carbon have been unsuccessful.

Purpose of the Study:

  • To develop a reliable method for synthesizing the BC8 carbon phase.
  • To provide experimental evidence for the existence of BC8 carbon.
  • To explore the thermodynamic pathway for BC8 carbon formation under extreme conditions.

Main Methods:

  • Development of a machine learning potential for carbon under high pressure, fitted from first-principles calculations.
  • Utilizing molecular dynamics simulations based on the machine learning potential.
  • Designing and simulating a double shock compression experimental pathway.

Main Results:

  • A feasible thermodynamic pathway for synthesizing BC8 carbon via double shock compression was designed.
  • Diamond was compressed to a supercooled liquid state and then solidified into the BC8 phase.
  • Calculations of critical nucleus size and nucleation rate provide parameters for experimental observation.

Conclusions:

  • The study presents a viable experimental approach to synthesize the long-sought BC8 carbon phase.
  • Achieving BC8 carbon relies on forming a sufficiently supercooled liquid state.
  • This research bridges the gap between theoretical prediction and experimental realization of BC8 carbon.