Screw Dislocations in Graphite

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Science  12 Feb 1965:
Vol. 147, Issue 3659, pp. 733-734
DOI: 10.1126/science.147.3659.733


Graphite contains varying concentrations of screw dislocations whose Burgers vector parallels the c axis. Single crystals of natural graphite contain very few such dislocations; furthermore, their Burgers vector always exceeds 450 angstroms. Pyrolytic graphites annealed above 3000°C contain abundant screw dislocations, ranging from 106 to 5 x 108 per square centimeter in two different samples prepared by somewhat different methods. The Burgers vectors of these screws are predominantly 3.35 angstroms.

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