Abstract
IT was shown by Seal1 that little change was produced by heating natural diamond powders to 1,200° C. in a vacuum (10−4 mm. mercury) for periods of 15–30 min. Heating the powders to 2,000° C. resulted in a complete transformation to graphite. For temperatures of about 1,500° C. both diamond and graphite could afterwards be detected, and, in addition, the electron diffraction patterns showed extra spots not due to either diamond or graphite. Seal advanced the theory that these extra reflexions were due to some intermediate arrangement of carbon atoms in diamond, possibly a regular array of diamond and graphite-like regions.
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References
Seal, M., Nature, 182, 1264 (1958).
Raal, F. A., Amer. Mineral., 42, 354 (1957).
Tammann, C., Z. anorg. Chem., 115, 141 (1921).
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RAAL, F. Alleged Formation of an Intermediate Diamond Structure on Heating Diamond. Nature 185, 523 (1960). https://doi.org/10.1038/185523a0
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DOI: https://doi.org/10.1038/185523a0
