@article{oai:nagoya.repo.nii.ac.jp:00030867,
 author = {Naka, Shigeharu and Hirano, Shin-ichi},
 issue = {2},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Mar},
 note = {The behaviors of various carboneous materials under high pressure and temperature conditions have been studied by monitoring in situ the change in electric current against voltage applied to the sample itself (the so-called “electro-thermal analysis) under pressure. The reproducibility of the analysis can be confirmed by controlling the dimension and the charge density of the starting carbon sample in a pressure cell. The diamond formation was found to depend strongly on the degree of graphitization and the structural factors of the carbon material used. The higher the crystallinity and the less the deformation of the starting carbon material, the lower the onset temperature for the diamond formation under otherwise the same condition. The pressure of 120 kb (12 GPa) is essential to convert graphite to diamond without any induction period. Amorphous glassy carbon with the characteristic bond nature yields graphite as a metastable phase prior to the diamond formation, even when heat-treated in the diamond stable region. In this case, diamond crystals nucleate on metastably formed graphite crystal and intergrow, with increasing temperature at 90 kb (9 GPa). Carbon spherulites with different graphitizability could be synthesized by the pressure pyrolysis of appropriate organic compounds, which brings about the route to synthesize diamond at a desired rate and the improvement of the texture of intergrown diamond polycrystals formed.},
 pages = {129--163},
 title = {Study of behaviors of various carbons under high pressure and temperature conditions by electro-thermal analysis},
 volume = {33},
 year = {1982}
}