Nanotubes of hexagonal boron nitride ( h -BN) have been synthesized by arc discharge between ZrB 2 electrodes in a nitrogen atmosphere. A new morphology of BN nanotubes at their tips, exhibiting a “triangular flag” like shape, was observed by transmission electron microscopy. This morphology suggests the presence of energetically unfavorable odd-membered rings (e.g., pentagons and heptagons) in addition to favorable even-membered rings (e.g., squares).
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Saito et al. (1999) studied this question.
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