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# Screw Dislocations in Graphite

G. R. Hennig
Science
New Series, Vol. 147, No. 3659 (Feb. 12, 1965), pp. 733-734
Stable URL: http://www.jstor.org/stable/1715391
Page Count: 2
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## Abstract

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 10$^{6}$ to 5 $\times$ 10$^{8}$ 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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