high-pressure graphitization

https://doi.org/10.1351/goldbook.H02824
A term which refers to the solid-state
transformation
of
non-graphitic carbon
into
graphite
by heat treatment under elevated pressure (e.g. 100 to 1000 MPa) so that a definitely higher degree of
graphitization
is achieved at lower temperature and/or for a shorter heat treatment time than in heat treatment of the same non-graphitic material at atmospheric pressure.
Source:
PAC, 1995, 67, 473. (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 495 [Terms] [Paper]