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摘要
En 中文
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 × 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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