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In situ analysis of the structural transformation of glassy carbon under compression at room temperature

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5];  [2];  [2];  [6];  [7];  [1]
  1. Australian National Univ., Canberra, ACT (Australia)
  2. Curtin Univ., Perth, WA (United States)
  3. RMIT Univ., Melbourne, VIC (Australia)
  4. Univ. of Sydney, NSW (Australia)
  5. Carnegie Inst. of Washington, Washington, DC (United States)
  6. Carnegie Inst. of Washington, Washington, DC (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Room temperature compression of graphitic materials leads to interesting superhard sp3 rich phases which are sometimes transparent. In the case of graphite itself, the sp3 rich phase is proposed to be monoclinic M-carbon; however, for disordered materials such as glassy carbon the nature of the transformation is unknown. We compress glassy carbon at room temperature in a diamond anvil cell, examine the structure in situ using x-ray diffraction, and interpret the findings with molecular dynamics modeling. Experiment and modeling both predict a two-stage transformation. First, the isotropic glassy carbon undergoes a reversible transformation to an oriented compressed graphitic structure. This is followed by a phase transformation at ~35 GPa to an unstable, disordered sp3 rich structure that reverts on decompression to an oriented graphitic structure. Analysis of the simulated sp3 rich material formed at high pressure reveals a noncrystalline structure with two different sp3 bond lengths.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
OSTI ID:
1607302
Alternate ID(s):
OSTI ID: 1492909
OSTI ID: 1494751
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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