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Atomistic evidence of nucleation mechanism for the direct graphite-to-diamond transformation

Journal Article · · Carbon
 [1];  [2];  [3];  [4];  [5];  [4];  [4];  [2];  [6];  [4]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States); Chinese Academy of Sciences, Xi'an (China)
  2. Center for High Pressure Science and Technology Advanced Research, Beijing (China)
  3. Hebei University of Technology, Tianjin (China)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States)
  5. Chinese Academy of Sciences, Xi'an (China)
  6. Center for High Pressure Science and Technology Advanced Research, Beijing (China); Institute for Shanghai Advanced Research in Physical Sciences, Shanghai (China)
The direct graphite-to-diamond transformation mechanism has been a subject of intense study and remains debated concerning the initial stages of the conversion, the intermediate phases, and their transformation pathways. Here, we successfully recover samples at the early conversion stage by tuning high-pressure/high-temperature conditions and reveal direct evidence supporting the nucleation-growth mechanism. Atomistic observations show that intermediate orthorhombic graphite phase mediates the growth of diamond nuclei. Furthermore, we observe that quenchable orthorhombic and rhombohedra graphite are stabilized in buckled graphite at lower temperatures. These intermediate phases are further converted into hexagonal and cubic diamond at higher temperatures following energetically favorable pathways in the order: graphite → orthorhombic graphite → hexagonal diamond, graphite → orthorhombic graphite → cubic diamond, graphite → rhombohedra graphite → cubic diamond. Furthermore, these results significantly improve our understanding of the transformation mechanism, enabling the synthesis of different high-quality forms of diamond from graphite.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2587361
Journal Information:
Carbon, Journal Name: Carbon Vol. 229; ISSN 0008-6223
Publisher:
Elsevier BVCopyright Statement
Country of Publication:
United States
Language:
English

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