Oakland Univ., Rochester, MI (United States); GFZ German Research Center for Geosciences, Potsdam (Germany); Max Planck Institut für Eisenforschung GmbH, Düsseldorf (Germany)
Technion-Israel Institute of Technology, Haifa (Israel)
Tokyo Institute of Technology (Japan)
GFZ German Research Center for Geosciences, Potsdam (Germany); Carl Zeiss Microscopy GmbH Germany)
Oakland Univ., Rochester, MI (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Univ. of Chicago, IL (United States)
Carnegie Inst. of Washington, Washington, DC (United States)
Here, we have studied the high-pressure vibrational and structural behavior of bulk graphite and graphene nanoplatelets at room temperature by means of high-pressure Raman spectroscopic and x-ray diffraction probes. We have detected a clear pressure-induced structural transition in both materials, evidenced by the appearance of new Bragg peaks and Raman features, deviating from the starting hexagonal graphitic structure. The high-pressure phase is identified as a partially disordered orthorhombic structure, consisting of mixed sp2- and sp3-type bonding. Our experimental findings serve as direct evidence for the existence of a metastable transient modification in cold compressed carbon, lying between the sp2-type graphite and sp3-type diamond allotropes.
@article{osti_2377452,
author = {Efthimiopoulos, Ilias and Stavrou, Elissaios and Umemoto, Koichiro and Mayanna, Sathish and Torode, Antonius and Smith, Jesse S. and Chariton, Stella and Prakapenka, Vitali B. and Goncharov, Alexander F. and Wang, Yuejian},
title = {High-pressure phase of cold-compressed bulk graphite and graphene nanoplatelets},
annote = {Here, we have studied the high-pressure vibrational and structural behavior of bulk graphite and graphene nanoplatelets at room temperature by means of high-pressure Raman spectroscopic and x-ray diffraction probes. We have detected a clear pressure-induced structural transition in both materials, evidenced by the appearance of new Bragg peaks and Raman features, deviating from the starting hexagonal graphitic structure. The high-pressure phase is identified as a partially disordered orthorhombic structure, consisting of mixed sp2- and sp3-type bonding. Our experimental findings serve as direct evidence for the existence of a metastable transient modification in cold compressed carbon, lying between the sp2-type graphite and sp3-type diamond allotropes.},
doi = {10.1103/physrevb.107.184102},
url = {https://www.osti.gov/biblio/2377452},
journal = {Physical Review. B},
issn = {ISSN 2469-9950},
number = {18},
volume = {107},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2023},
month = {05}}
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, Vol. 358, Issue 1766https://doi.org/10.1098/rsta.2000.0542